Question

Find the possible value or values of r in the quadratic equation r2 – 7r – 8 = 0.

Answer 1

-1 and 8

Explanation:

-8 · 1 = -8

-8 + 1 = -7

(r - 8)(r + 1) = 0

r -8 = 0

r = 8

r+1 = 0

r = -1