Quadratic Equations
Q. Determine the product of the roots of the equation x² + 6x + 9 = 0. (2021)
Solution
The product of the roots is c/a = 9/1 = 9.
Correct Answer: A — 9
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Q. Determine the roots of the equation x² + 2x - 8 = 0. (2023)
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A.
-4 and 2
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B.
4 and -2
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C.
2 and -4
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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: A — -4 and 2
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Q. Find the roots of the equation x² + 2x - 8 = 0. (2022)
-
A.
-4 and 2
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B.
4 and -2
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C.
2 and -4
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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: B — 4 and -2
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Q. Find the value of k for which the equation x² + 4x + k = 0 has no real roots. (2020)
Solution
The discriminant must be negative: 4² - 4*1*k < 0, which gives k > 4, so the minimum value is -6.
Correct Answer: B — -6
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Q. Find the value of k for which the equation x² + kx + 16 = 0 has equal roots. (2022)
Solution
For equal roots, the discriminant must be zero: k² - 4*1*16 = 0, thus k² = 64, k = ±8. The value of k can be -8.
Correct Answer: A — -8
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Q. Find the value of k if the equation x² + kx + 16 = 0 has no real roots. (2022)
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A.
k < 8
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B.
k > 8
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C.
k < 0
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D.
k > 0
Solution
For no real roots, the discriminant must be less than zero: k² - 4*1*16 < 0, which gives k > 8.
Correct Answer: B — k > 8
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Q. For the equation x² + 6x + k = 0 to have real roots, what is the minimum value of k? (2021)
Solution
The discriminant must be non-negative: 6² - 4*1*k ≥ 0, which gives k ≤ 9, so the minimum value is -9.
Correct Answer: A — -9
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Q. For the quadratic equation x² + 6x + k = 0 to have real roots, what is the minimum value of k? (2021)
Solution
The discriminant must be non-negative: 6² - 4*1*k ≥ 0, thus k ≤ 9. The minimum value of k is -9.
Correct Answer: A — -9
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Q. For which value of m does the equation x² - mx + 9 = 0 have roots 3 and 3? (2023)
Solution
The sum of the roots is 3 + 3 = 6, hence m = 6.
Correct Answer: A — 6
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Q. For which value of p does the equation x² + px + 4 = 0 have roots 2 and -2? (2022)
Solution
Using the sum of roots: 2 + (-2) = -p, hence p = 0.
Correct Answer: C — -4
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Q. For which value of p does the equation x² + px + 4 = 0 have roots that are both negative? (2022)
Solution
For both roots to be negative, p must be greater than 0 and p² > 16. Thus, p < -4.
Correct Answer: C — -4
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Q. For which value of p does the equation x² + px + 9 = 0 have roots that are both negative? (2021)
Solution
For both roots to be negative, p must be positive and p² > 4*9. Thus, p > 6, so p = -4 is valid.
Correct Answer: B — -4
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Q. If one root of the equation x² - 7x + k = 0 is 3, find k. (2023)
Solution
Using the root, substitute x = 3: 3² - 7*3 + k = 0, which gives k = 10.
Correct Answer: A — 10
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Q. If one root of the equation x² - 7x + k = 0 is 3, what is the value of k? (2020)
Solution
Using the root, substitute x = 3: 3² - 7*3 + k = 0, which gives k = 9.
Correct Answer: D — 9
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Q. If the roots of the equation x² + 2x + k = 0 are 1 and -3, what is the value of k? (2020)
Solution
Using the sum and product of roots: 1 + (-3) = -2 and 1 * (-3) = -3, thus k = 3.
Correct Answer: C — 3
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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 + 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 + 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 + 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. 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 - 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 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 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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Q. What is the product of the roots of the equation x² - 10x + 24 = 0? (2021)
Solution
The product of the roots is given by c/a = 24/1 = 24.
Correct Answer: A — 24
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Q. What is the product of the roots of the equation x² - 8x + 15 = 0? (2022)
Solution
The product of the roots is given by c/a = 15/1 = 15.
Correct Answer: A — 15
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Q. What is the sum of the roots of the equation 2x² - 4x + 1 = 0? (2023)
Solution
The sum of the roots is given by -b/a = 4/2 = 2.
Correct Answer: A — 2
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Q. What is the value of k for which the equation x² - 6x + k = 0 has roots 2 and 4? (2022)
Solution
The product of the roots is k = 2 * 4 = 8.
Correct Answer: B — 12
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