Q. Determine if the function f(x) = x^3 - 3x + 2 is differentiable at x = 1.
A.
Yes
B.
No
C.
Only from the left
D.
Only from the right
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Solution
f(x) is a polynomial function, which is differentiable everywhere, including at x = 1.
Correct Answer:
A
— Yes
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Q. Determine if the function f(x) = { x^2, x < 0; 1/x, x > 0 } is continuous at x = 0.
A.
Yes
B.
No
C.
Depends on limit
D.
None of the above
Show solution
Solution
The left limit is 0 and the right limit is undefined. Thus, f(x) is not continuous at x = 0.
Correct Answer:
B
— No
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Q. Determine if the function f(x) = { x^2, x < 1; 3, x = 1; 2x, x > 1 } is continuous at x = 1.
A.
Continuous
B.
Not continuous
C.
Depends on k
D.
None of the above
Show solution
Solution
At x = 1, f(1) = 3, but lim x->1- f(x) = 1 and lim x->1+ f(x) = 2. Thus, it is not continuous.
Correct Answer:
B
— Not continuous
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Q. Determine if the function f(x) = { x^2, x < 1; x + 1, x >= 1 } is continuous at x = 1.
A.
Yes
B.
No
C.
Depends on x
D.
None of the above
Show solution
Solution
Both sides equal 2 at x = 1, hence it is continuous.
Correct Answer:
A
— Yes
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Q. Determine if the function f(x) = |x - 1| is differentiable at x = 1.
A.
Yes
B.
No
C.
Only from the left
D.
Only from the right
Show solution
Solution
The left-hand derivative is -1 and the right-hand derivative is 1. Since they are not equal, f(x) is not differentiable at x = 1.
Correct Answer:
B
— No
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Q. Determine the angle between the lines y = 2x + 1 and y = -1/2x + 3. (2021)
A.
90 degrees
B.
45 degrees
C.
60 degrees
D.
30 degrees
Show solution
Solution
The slopes are m1 = 2 and m2 = -1/2. The angle θ = tan⁻¹(|(m1 - m2) / (1 + m1*m2)|) = tan⁻¹(5/3), which is approximately 90 degrees.
Correct Answer:
A
— 90 degrees
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Q. Determine the angle between the lines y = 2x + 3 and y = -1/2x + 1.
A.
90 degrees
B.
60 degrees
C.
45 degrees
D.
30 degrees
Show solution
Solution
The slopes are m1 = 2 and m2 = -1/2. The angle θ = tan^(-1) |(m1 - m2)/(1 + m1*m2)| = tan^(-1)(5/4) which is approximately 60 degrees.
Correct Answer:
B
— 60 degrees
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Q. Determine the area between the curves y = x^3 and y = x from x = 0 to x = 1.
A.
1/4
B.
1/3
C.
1/2
D.
1/6
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Solution
The area is given by the integral from 0 to 1 of (x - x^3) dx. This evaluates to [x^2/2 - x^4/4] from 0 to 1 = (1/2 - 1/4) = 1/4.
Correct Answer:
A
— 1/4
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Q. Determine the area enclosed by the curves y = x^2 and y = 4.
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Solution
The area enclosed is found by integrating from -2 to 2: ∫(from -2 to 2) (4 - x^2) dx = [4x - x^3/3] from -2 to 2 = (8 - 8/3) - (-8 + 8/3) = 16/3.
Correct Answer:
C
— 16/3
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Q. Determine the area of the triangle formed by the points (0, 0), (4, 0), and (0, 3).
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Solution
Area = 1/2 * base * height = 1/2 * 4 * 3 = 6.
Correct Answer:
A
— 6
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Q. Determine the area under the curve y = 1/x from x = 1 to x = 2.
A.
ln(2)
B.
ln(1)
C.
ln(2) - ln(1)
D.
ln(2) + ln(1)
Show solution
Solution
The area under the curve y = 1/x from x = 1 to x = 2 is given by ∫(from 1 to 2) (1/x) dx = [ln(x)] from 1 to 2 = ln(2) - ln(1) = ln(2).
Correct Answer:
A
— ln(2)
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Q. Determine the area under the curve y = e^x from x = 0 to x = 1.
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Solution
The area under the curve y = e^x from 0 to 1 is given by ∫(from 0 to 1) e^x dx = [e^x] from 0 to 1 = e - 1.
Correct Answer:
A
— e - 1
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Q. Determine the coefficient of x^2 in the expansion of (3x - 4)^4.
A.
144
B.
216
C.
108
D.
96
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Solution
The coefficient of x^2 is C(4,2) * (3)^2 * (-4)^2 = 6 * 9 * 16 = 864.
Correct Answer:
B
— 216
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Q. Determine the coefficient of x^2 in the expansion of (3x - 4)^6.
A.
540
B.
720
C.
480
D.
360
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Solution
The coefficient of x^2 is C(6,2) * (3)^2 * (-4)^4 = 15 * 9 * 256 = 34560.
Correct Answer:
B
— 720
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Q. Determine the coefficient of x^2 in the expansion of (x - 2)^6.
A.
-60
B.
-30
C.
15
D.
20
Show solution
Solution
The coefficient of x^2 is C(6,2)(-2)^4 = 15 * 16 = 240.
Correct Answer:
A
— -60
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Q. Determine the coefficient of x^4 in the expansion of (2x - 3)^6.
A.
540
B.
720
C.
810
D.
960
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Solution
The coefficient of x^4 is given by 6C4 * (2)^4 * (-3)^2 = 15 * 16 * 9 = 2160.
Correct Answer:
B
— 720
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Q. Determine the coefficient of x^5 in the expansion of (3x - 4)^7.
A.
252
B.
336
C.
672
D.
840
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Solution
The coefficient of x^5 in (3x - 4)^7 is C(7, 5) * (3)^5 * (-4)^2 = 21 * 243 * 16 = 68016.
Correct Answer:
A
— 252
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Q. Determine the condition for the lines represented by ax^2 + 2hxy + by^2 = 0 to be perpendicular.
A.
h^2 = ab
B.
h^2 = -ab
C.
a + b = 0
D.
a - b = 0
Show solution
Solution
The lines are perpendicular if 2h = a + b, which leads to h^2 = -ab.
Correct Answer:
B
— h^2 = -ab
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Q. Determine the condition for the lines represented by ax^2 + 2hxy + by^2 = 0 to be parallel.
A.
h^2 = ab
B.
h^2 > ab
C.
h^2 < ab
D.
h^2 ≠ ab
Show solution
Solution
The lines are parallel if the discriminant of the quadratic equation is zero, which leads to the condition h^2 = ab.
Correct Answer:
A
— h^2 = ab
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Q. Determine the condition for the lines represented by the equation 4x^2 + 4xy + y^2 = 0 to be coincident.
A.
b^2 - 4ac = 0
B.
b^2 - 4ac > 0
C.
b^2 - 4ac < 0
D.
b^2 - 4ac = 1
Show solution
Solution
For the lines to be coincident, the discriminant must be zero, i.e., b^2 - 4ac = 0.
Correct Answer:
A
— b^2 - 4ac = 0
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Q. Determine the condition for the lines represented by the equation ax^2 + 2hxy + by^2 = 0 to be perpendicular.
A.
a + b = 0
B.
ab = h^2
C.
a - b = 0
D.
h = 0
Show solution
Solution
The lines are perpendicular if the condition a + b = 0 holds true.
Correct Answer:
A
— a + b = 0
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Q. Determine the continuity of f(x) = { 1/x, x != 0; 0, x = 0 } at x = 0.
A.
Continuous
B.
Not continuous
C.
Depends on limit
D.
None of the above
Show solution
Solution
The limit as x approaches 0 does not exist, hence f(x) is not continuous at x = 0.
Correct Answer:
B
— Not continuous
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Q. Determine the continuity of f(x) = { x^2 - 1, x < 1; 3, x = 1; 2x, x > 1 } at x = 1.
A.
Continuous
B.
Discontinuous
C.
Depends on x
D.
Not defined
Show solution
Solution
The left limit is 0, the right limit is 2, and f(1) = 3. Thus, it is discontinuous.
Correct Answer:
B
— Discontinuous
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Q. Determine the continuity of the function f(x) = { x^2, x < 1; 2, x = 1; x + 1, x > 1 } at x = 1.
A.
Continuous
B.
Not continuous
C.
Depends on the limit
D.
Only left continuous
Show solution
Solution
The left limit as x approaches 1 is 1, the right limit is 2, and f(1) = 2. Since the left and right limits do not match, f(x) is not continuous at x = 1.
Correct Answer:
B
— Not continuous
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Q. Determine the continuity of the function f(x) = { x^2, x < 1; 2x - 1, x >= 1 } at x = 1.
A.
Continuous
B.
Not continuous
C.
Depends on the limit
D.
Only left continuous
Show solution
Solution
The left limit as x approaches 1 is 1, and the right limit is also 1. Thus, f(1) = 1, making it continuous.
Correct Answer:
A
— Continuous
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Q. Determine the continuity of the function f(x) = { x^2, x < 1; 2x - 1, x ≥ 1 } at x = 1.
A.
Continuous
B.
Discontinuous
C.
Only left continuous
D.
Only right continuous
Show solution
Solution
At x = 1, f(1) = 2(1) - 1 = 1 and lim x→1- f(x) = 1, lim x→1+ f(x) = 1. Thus, f(x) is continuous at x = 1.
Correct Answer:
A
— Continuous
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Q. Determine the continuity of the function f(x) = |x| at x = 0. (2020)
A.
Continuous
B.
Not continuous
C.
Depends on the limit
D.
Only left continuous
Show solution
Solution
The function f(x) = |x| is continuous at x = 0 since both the left-hand limit and right-hand limit equal f(0) = 0.
Correct Answer:
A
— Continuous
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Q. Determine the coordinates of the centroid of the triangle with vertices A(0, 0, 0), B(4, 0, 0), C(0, 3, 0). (2023)
A.
(1, 1, 0)
B.
(2, 1, 0)
C.
(4/3, 1, 0)
D.
(0, 1, 0)
Show solution
Solution
Centroid G = ((0+4+0)/3, (0+0+3)/3, (0+0+0)/3) = (4/3, 1, 0).
Correct Answer:
B
— (2, 1, 0)
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Q. Determine the coordinates of the centroid of the triangle with vertices A(0, 0, 0), B(6, 0, 0), and C(0, 8, 0). (2023)
A.
(2, 2, 0)
B.
(2, 3, 0)
C.
(3, 2, 0)
D.
(0, 0, 0)
Show solution
Solution
Centroid = ((0+6+0)/3, (0+0+8)/3, (0+0+0)/3) = (2, 2.67, 0).
Correct Answer:
A
— (2, 2, 0)
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Q. Determine the coordinates of the centroid of the triangle with vertices A(0, 0, 0), B(0, 4, 0), and C(3, 0, 0). (2021)
A.
(1, 1.33, 0)
B.
(1, 2, 0)
C.
(0, 1.33, 0)
D.
(0, 2, 0)
Show solution
Solution
Centroid = ((0+0+3)/3, (0+4+0)/3, (0+0+0)/3) = (1, 1.33, 0).
Correct Answer:
B
— (1, 2, 0)
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