Hi,      

Solving

 x^2 - 3x - 4 = 0    OR y = (x-3/2)^2 - 25/4 (vertex form by completing square)

factoring

(x-4)(x+1)=0 Note:SUM of the inner product(-4x) and the outer product(1*x) = -3x

(x-4)=0   x = 4

(x+1)=0   x = -1



 

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