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

       A. r = 8, r = –1   B. r = 2/3, r = 5   C. r = –10, r = 3   D.

Respuesta :

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
micoarrafi
Factoring in the quadratic equations

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

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