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11-10-2020
Mathematics

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What are the solutions for x when y is equal to 0 in the quadratic function
y= x2 + x - 72?

What are the solutions for x when y is equal to 0 in the quadratic function y x2 x 72 class=

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mieraanh mieraanh

11-10-2020

0 = x^2 + x - 72
x^2 + x - 72 = 0
x^2 + 9x - 8x - 72 = 0
X (x + 9) - 8 (x + 9) = 0
(X + 9) (x - 8) = 0

X + 9 = 0
X = -9

X - 8 = 0
X = 8

X (-9,8)

Answer is Option D
x = -9 or x = 8

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