Q. If the roots of the equation x² + 2x + k = 0 are real and distinct, what is the condition for k? (2020)
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A.
k > 1
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B.
k < 1
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C.
k > 4
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D.
k < 4
Solution
The discriminant must be greater than zero: 2² - 4*1*k > 0, which simplifies to k < 1.
Correct Answer: C — k > 4
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Q. If the roots of the equation x² + 5x + 6 = 0 are a and b, what is the value of a + b? (2019)
Solution
The sum of the roots is given by -b/a = -5/1 = -5.
Correct Answer: A — 5
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Q. If the roots of the equation x² + 5x + k = 0 are -2 and -3, find k. (2020)
Solution
Using the product of roots: k = (-2)(-3) = 6.
Correct Answer: A — 6
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Q. If the roots of the equation x² + 5x + k = 0 are 1 and 4, find k. (2020)
Solution
Using the sum and product of roots: k = 1*4 = 4, and sum = 1 + 4 = 5, thus k = 7.
Correct Answer: D — 7
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Q. If the roots of the equation x² + 5x + q = 0 are 1 and 4, find q. (2019)
Solution
Using the product of roots: q = 1 * 4 = 4.
Correct Answer: A — 5
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Q. If the roots of the equation x² + 7x + k = 0 are -3 and -4, find k. (2022)
Solution
Using the sum of roots (-3 + -4 = -7) and product of roots (-3*-4 = 12), we find k = 12.
Correct Answer: A — 12
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Q. If the roots of the equation x² + 7x + k = 0 are 1 and 6, what is the value of k? (2020)
Solution
Using the product of roots, k = 1*6 = 6.
Correct Answer: C — 8
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Q. If the roots of the equation x² + 7x + p = 0 are -3 and -4, find p. (2019)
Solution
Using the sum of roots (-3 + -4 = -7) and product of roots (-3*-4 = 12), we find p = 12.
Correct Answer: A — 12
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Q. If the roots of the equation x² + 7x + p = 0 are -3 and -4, find the value of p. (2019)
Solution
Using the product of roots: p = (-3)(-4) = 12.
Correct Answer: A — 12
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Q. If the roots of the equation x² + mx + n = 0 are 1 and -1, find m and n. (2020)
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A.
0, 1
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B.
2, 1
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C.
0, 0
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D.
1, 1
Solution
The sum of the roots is 0 (m = 0) and the product is -1 (n = 1).
Correct Answer: A — 0, 1
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Q. If the roots of the equation x² + px + 12 = 0 are 3 and 4, find p. (2020)
Solution
Using the sum of the roots: p = -(3 + 4) = -7.
Correct Answer: A — -7
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Q. If the roots of the equation x² + px + 12 = 0 are 3 and 4, what is the value of p? (2020)
Solution
The sum of the roots is -p = 3 + 4 = 7, hence p = -7.
Correct Answer: A — -7
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Q. If the roots of the equation x² + px + q = 0 are 3 and -2, what is the value of p? (2019)
Solution
Using the sum of roots formula, p = -(3 + (-2)) = -1, hence p = -1.
Correct Answer: C — 5
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Q. The quadratic equation x² + 4x + 4 = 0 has how many distinct roots? (2021)
Solution
The discriminant is 4² - 4*1*4 = 0, indicating one distinct root.
Correct Answer: B — 1
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Q. The roots of the equation x² + 2x + k = 0 are real and distinct if k is: (2020)
-
A.
< 1
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B.
≥ 1
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C.
≤ 1
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D.
> 1
Solution
For real and distinct roots, the discriminant must be positive: 2² - 4*1*k > 0, which simplifies to k < 1.
Correct Answer: A — < 1
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Q. The roots of the equation x² + 4x + 4 = 0 are: (2020)
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A.
-2 and -2
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B.
2 and 2
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C.
0 and 4
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D.
1 and 3
Solution
The equation can be factored as (x + 2)² = 0, giving the double root x = -2.
Correct Answer: A — -2 and -2
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Q. The roots of the equation x² + 4x + k = 0 are 2 and -6. What is the value of k? (2021)
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A.
-12
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B.
-8
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C.
-10
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D.
-14
Solution
Using the product of roots: k = 2 * (-6) = -12. The sum is 2 + (-6) = -4, which matches.
Correct Answer: B — -8
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Q. The roots of the equation x² - 8x + k = 0 are 4 and 4. Find k. (2021)
Solution
Using the product of roots: k = 4 * 4 = 16.
Correct Answer: A — 16
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Q. What are the roots of the equation 3x² - 12x + 12 = 0? (2019)
Solution
Dividing the equation by 3 gives x² - 4x + 4 = 0, which factors to (x - 2)² = 0, hence the root is 2.
Correct Answer: B — 4
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Q. What are the roots of the equation x² - 2x - 8 = 0? (2022)
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A.
-2 and 4
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B.
2 and -4
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C.
4 and -2
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D.
0 and 8
Solution
Factoring gives (x - 4)(x + 2) = 0, hence the roots are 4 and -2.
Correct Answer: C — 4 and -2
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Q. What are the roots of the equation x² - 5x + 6 = 0? (2021)
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A.
1 and 6
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B.
2 and 3
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C.
3 and 2
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D.
0 and 5
Solution
The roots can be found using the factorization method: (x - 2)(x - 3) = 0, hence the roots are 2 and 3.
Correct Answer: B — 2 and 3
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Q. What is the discriminant of the equation 3x² - 12x + 12 = 0? (2023)
Solution
The discriminant is b² - 4ac = (-12)² - 4*3*12 = 144 - 144 = 0.
Correct Answer: A — 0
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Q. What is the discriminant of the equation 3x² - 12x + 9 = 0? (2023)
Solution
The discriminant is b² - 4ac = (-12)² - 4*3*9 = 0.
Correct Answer: A — 0
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Q. What is the discriminant of the equation 4x² - 12x + 9 = 0? (2019)
Solution
The discriminant is b² - 4ac = (-12)² - 4*4*9 = 144 - 144 = 0.
Correct Answer: A — 0
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Q. What is the discriminant of the equation x² + 6x + 9 = 0? (2020)
Solution
The discriminant is b² - 4ac = 6² - 4*1*9 = 0.
Correct Answer: A — 0
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Q. What is the nature of the roots of the equation x² + 2x + 5 = 0? (2023)
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A.
Real and distinct
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B.
Real and equal
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C.
Complex
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D.
None of the above
Solution
The discriminant D = 2² - 4*1*5 = 4 - 20 = -16, which indicates complex roots.
Correct Answer: C — Complex
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Q. What is the product of the roots of the equation 2x² - 8x + 6 = 0? (2022)
Solution
The product of the roots is given by c/a = 6/2 = 3.
Correct Answer: A — 3
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Q. What is the product of the roots of the equation 3x² - 12x + 9 = 0? (2022)
Solution
The product of the roots is given by c/a = 9/3 = 3.
Correct Answer: B — 3
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Q. What is the product of the roots of the equation 3x² - 6x + 2 = 0? (2023)
-
A.
1/3
-
B.
2/3
-
C.
1/2
-
D.
1
Solution
The product of the roots is given by c/a = 2/3.
Correct Answer: B — 2/3
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Q. What is the product of the roots of the equation x² + 5x + 6 = 0? (2022)
Solution
The product of the roots is given by c/a = 6/1 = 6.
Correct Answer: A — 6
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