Q. What is the sum of the roots of the polynomial x^2 - 4x + 4?
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Solution
The sum of the roots of a quadratic equation ax^2 + bx + c is given by -b/a. Here, -(-4)/1 = 4.
Correct Answer:
B
— 4
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Q. What is the sum of the roots of the polynomial x^2 - 5x + 6?
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Solution
The sum of the roots of a quadratic equation ax^2 + bx + c is given by -b/a. Here, -(-5)/1 = 5.
Correct Answer:
A
— 5
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Q. What is the sum of the roots of the quadratic equation 2x^2 + 4x - 6 = 0?
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Solution
Step 1: Use the formula -b/a. Here, b = 4 and a = 2. Step 2: Sum of roots = -4/2 = -2.
Correct Answer:
A
— -2
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Q. What is the sum of the roots of the quadratic equation x^2 + 3x - 10 = 0?
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Solution
The sum of the roots of a quadratic equation ax^2 + bx + c = 0 is given by -b/a. Here, b = 3 and a = 1, so the sum is -3/1 = -3.
Correct Answer:
A
— -3
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Q. What is the sum of the roots of the quadratic equation x^2 + 4x + 4 = 0?
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Solution
The sum of the roots is given by -b/a = -4/1 = -4.
Correct Answer:
A
— -4
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Q. What is the sum of the roots of the quadratic equation x^2 + 6x + 9 = 0?
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Solution
Step 1: Use the formula -b/a. Here, b = 6 and a = 1. Step 2: The sum of the roots is -6/1 = -6.
Correct Answer:
A
— -6
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Q. What is the sum of the roots of the quadratic equation x^2 - 6x + 8 = 0?
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Solution
Step 1: Use the sum of roots formula -b/a. Here, b = -6, a = 1. Step 2: Sum = 6.
Correct Answer:
A
— 6
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Q. What is the value of 7 + 5 × 2?
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Solution
According to the order of operations, we first multiply 5 by 2 to get 10, then add 7 to get 17.
Correct Answer:
B
— 17
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Q. What is the value of 9² - 4²?
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Solution
9² = 81 and 4² = 16. Therefore, 81 - 16 = 65.
Correct Answer:
A
— 77
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Q. What is the value of cos(45°)?
A.
0
B.
1/2
C.
√2/2
D.
√3/2
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Solution
cos(45°) = √2/2.
Correct Answer:
C
— √2/2
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Q. What is the value of k if the equation 2x^2 + kx + 3 = 0 has one solution?
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Solution
For one solution, the discriminant must be zero: k^2 - 4(2)(3) = 0. Thus, k^2 = 24, so k = ±√24 = ±2√6. The integer value is -4.
Correct Answer:
B
— -4
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Q. What is the value of k if the equation x^2 + kx + 16 = 0 has one real solution?
A.
k = 8
B.
k = -8
C.
k = 0
D.
k = 4
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Solution
For one real solution, the discriminant must be zero: k^2 - 4(1)(16) = 0. Thus, k^2 = 64, so k = ±8.
Correct Answer:
B
— k = -8
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Q. What is the value of k if the polynomial x^2 + kx + 16 has roots 4 and -4?
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Solution
Using Vieta's formulas, the sum of the roots (4 + (-4)) = 0, so k = 0.
Correct Answer:
A
— -8
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Q. What is the value of k if the polynomial x^2 + kx + 16 has roots that are both 4?
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Solution
Using the fact that the sum of the roots is -k, we have 4 + 4 = -k, so k = -8.
Correct Answer:
A
— -8
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Q. What is the value of k if the polynomial x^2 + kx + 9 has roots 3 and -3?
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Solution
Using Vieta's formulas, the sum of the roots (3 + (-3)) = -k, so k = 0. The product of the roots (3 * -3) = 9, which is consistent. Thus, k = 0.
Correct Answer:
B
— 6
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Q. What is the value of k if x^2 + kx + 16 has roots 4 and -4?
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Solution
Using Vieta's formulas, the sum of the roots is -k = 4 + (-4) = 0, so k = 0.
Correct Answer:
A
— -8
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Q. What is the value of k if x^2 - kx + 12 has roots 3 and 4?
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Solution
Using the sum of roots, 3 + 4 = k, we find k = 7.
Correct Answer:
A
— 7
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Q. What is the value of sec(θ) if cos(θ) = 0.5?
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Solution
sec(θ) = 1/cos(θ) = 1/0.5 = 2.
Correct Answer:
C
— 2
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Q. What is the value of sin(π/6)?
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Solution
The value of sin(π/6) is 1/2.
Correct Answer:
B
— 1/2
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Q. What is the value of x in the equation 2(x + 5) = 20?
A.
x = 5
B.
x = 10
C.
x = 15
D.
x = 20
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Solution
Step 1: Divide both sides by 2: x + 5 = 10. Step 2: Subtract 5 from both sides: x = 5.
Correct Answer:
A
— x = 5
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Q. What is the value of x in the equation 2(x - 3) = 8?
A.
x = 5
B.
x = 6
C.
x = 7
D.
x = 8
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Solution
Step 1: Divide both sides by 2: x - 3 = 4. Step 2: Add 3 to both sides: x = 7.
Correct Answer:
B
— x = 6
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Q. What is the value of x in the equation 2x^2 - 4x - 6 = 0?
A.
x = 3
B.
x = -1
C.
x = 2
D.
x = -3
Show solution
Solution
Using the quadratic formula x = (-b ± √(b² - 4ac)) / 2a. Here, a = 2, b = -4, c = -6. Discriminant = (-4)² - 4(2)(-6) = 16 + 48 = 64. x = (4 ± √64) / 4 = (4 ± 8) / 4. Thus, x = 3 or x = -1.
Correct Answer:
A
— x = 3
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Q. What is the value of x in the equation 2x^2 - 8 = 0?
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Solution
First, add 8 to both sides: 2x^2 = 8. Then divide by 2: x^2 = 4. Taking the square root gives x = ±2. The positive solution is x = 2.
Correct Answer:
B
— 4
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Q. What is the value of x in the equation 3(x + 2) = 2(x + 5)?
A.
x = 1
B.
x = 2
C.
x = 3
D.
x = 4
Show solution
Solution
Step 1: Distribute: 3x + 6 = 2x + 10. Step 2: Subtract 2x from both sides: x + 6 = 10. Step 3: Subtract 6 from both sides: x = 4.
Correct Answer:
A
— x = 1
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Q. What is the value of x in the equation 3(x + 2) = 21?
A.
x = 5
B.
x = 7
C.
x = 3
D.
x = 1
Show solution
Solution
Divide both sides by 3: x + 2 = 7. Then subtract 2: x = 5.
Correct Answer:
A
— x = 5
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Q. What is the value of x in the equation 3(x - 1) = 2(x + 2)?
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Solution
Step 1: Distribute: 3x - 3 = 2x + 4. Step 2: Subtract 2x from both sides: x - 3 = 4. Step 3: Add 3 to both sides: x = 7.
Correct Answer:
B
— 0
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Q. What is the value of x in the equation 3(x - 1) = 2x + 4?
A.
x = 1
B.
x = 2
C.
x = 3
D.
x = 4
Show solution
Solution
Step 1: Distribute: 3x - 3 = 2x + 4. Step 2: Subtract 2x from both sides: x - 3 = 4. Step 3: Add 3 to both sides: x = 7.
Correct Answer:
B
— x = 2
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Q. What is the value of x in the equation 3(x - 2) = 12?
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Solution
Divide both sides by 3: x - 2 = 4. Then add 2: x = 6.
Correct Answer:
C
— 6
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Q. What is the value of x in the equation 3x + 2 = 11?
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Solution
Subtract 2 from both sides: 3x = 9. Then divide by 3: x = 3.
Correct Answer:
A
— 3
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Q. What is the value of x in the equation 3x + 4 = 10?
A.
x = 2
B.
x = 3
C.
x = 4
D.
x = 1
Show solution
Solution
To solve 3x + 4 = 10, subtract 4 from both sides: 3x = 6. Then divide by 3: x = 2.
Correct Answer:
A
— x = 2
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