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23 October, 08:39

Which quadratic equation crosses the x-axis at 4 and - 9?

A. y=x^2-5x-36

B. y=x^2+5x+36

C. y=x^2+5x-36

D. y=x^2-5x+36

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Answers (1)
  1. 23 October, 09:07
    0
    If it crosses at r1, r2 then it factors to f (x) = (x-r1) (x-r2)

    crosses at 4 and - 9

    factors to f (x) = (x-4) (x - (-9)) = (x-4) (x+9) = x²+5x-36

    answer is C
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