Hi

Solving equation by factoring

x^3 + 13x^2 + 40x = 0  Note ALL terms have x in common

x(x^2 + 13x + 40) = 0

x(x+8)(x+5) = 0 Note:SUM of the inner product(8x) and the outer product(5x) = 13x

x = 0

(x+8)= 0

x = -8

(x+5) = 0

x = -5 

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