Question 381630
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Hi,         
Solving for r
r^2-7r-8=0
Factoring
(r - 8)(r + 1)=0 Note:SUM of the inner product(-8r) and the outer product(1*r) = -7r
(r - 8)= 0
   r = 8
(r + 1)=0
   r = -1