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- If the roots of a quadratic equation are 20 and -7, then find the equation?
Question 1:
If the roots of a quadratic equation are 20 and -7, then find the equation? A. x² + 13x - 140 = 0
B. x² - 13x + 140 = 0
C. x² - 13x - 140 = 0
Feedback Any quadratic equation is of the form
x² - (sum of the roots)x + (product of the roots) = 0 ---- (1)
where x is a real variable. As sum of the roots is 13 and product of the roots is -140, the quadratic equation with roots as 20 and -7 is: x² - 13x - 140 = 0.
x² - (sum of the roots)x + (product of the roots) = 0 ---- (1)
where x is a real variable. As sum of the roots is 13 and product of the roots is -140, the quadratic equation with roots as 20 and -7 is: x² - 13x - 140 = 0.
D. x² + 13x + 140 = 0
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