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help me to answer 10-13. thank you

help me to answer 10-13. thank you

Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter12: Quadratic Functions
Section12.8: Joint And Combined Variation
Problem 2P
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help me to answer 10-13. thank you

D. The roots are 7. Which of the following quadratic equations has no real roots? A. 2x2 + 4x = 3 B. x2 -8x – 4 = 0 8. How many real roots does the quadratic equations x? + 5x + 7 - 0 have? A. 0 9. What is the nature of the roots of the quadratic equation if the value of its discriminant is negative? A. The roots are real. B. The roots are irrational and not equal C. The roots are rational and not equal %3D D. -2x2 + x + 7 = 0 В. 1 С. 2 D. 3 D. The roots are rational and equal. 10. What is the sum of the roots of the quadratic equations x2+6x-14 = 0? %3! A. -7 В. -6 C.-3 D. 14 11. What is the product of the root of the quadratic equations 2x+8x-10-0? A. 5 В. -5 C.4 D. -4 12. The length of a garden is 2m more than twice its width and its area is 24m2. Which of the following equations represents the given situation? A. x2 +x =12 B.x2 + 2x=12 C. x2 +x =24 D. x2 +2x = 24 13. The roots of a quadratic equations are -4 and -5. Which of the following quadratic equations has these roots? A. x + x -20%3D0 B. x - x +20=0 C. x +9x +2030 D. x2 -9x + 20-0
Transcribed Image Text:D. The roots are 7. Which of the following quadratic equations has no real roots? A. 2x2 + 4x = 3 B. x2 -8x – 4 = 0 8. How many real roots does the quadratic equations x? + 5x + 7 - 0 have? A. 0 9. What is the nature of the roots of the quadratic equation if the value of its discriminant is negative? A. The roots are real. B. The roots are irrational and not equal C. The roots are rational and not equal %3D D. -2x2 + x + 7 = 0 В. 1 С. 2 D. 3 D. The roots are rational and equal. 10. What is the sum of the roots of the quadratic equations x2+6x-14 = 0? %3! A. -7 В. -6 C.-3 D. 14 11. What is the product of the root of the quadratic equations 2x+8x-10-0? A. 5 В. -5 C.4 D. -4 12. The length of a garden is 2m more than twice its width and its area is 24m2. Which of the following equations represents the given situation? A. x2 +x =12 B.x2 + 2x=12 C. x2 +x =24 D. x2 +2x = 24 13. The roots of a quadratic equations are -4 and -5. Which of the following quadratic equations has these roots? A. x + x -20%3D0 B. x - x +20=0 C. x +9x +2030 D. x2 -9x + 20-0
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