Question

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

Answer 1

R^2-7r-8=0 

=> ( r - 8) ( r + 1 ) = 0 

=> r - 8 = 0 or r + 1 = 0 

=> r = 8 , r = -1
the answer is A

Answer 2

Factoring in the quadratic equations

$\begin{align} r^2-7r-8&=0\\(r-8)(r+1)&=0\\r&=\boxed{8\ or \ -1} \end$