Question

(x2 - 1) (x + 1) (x + 2)(x-4)​

Answer 1

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Step-by-step explanation:

2x(x+1)-1(x+1)+x(x-4)+2(x-4)

2x^2+2x-1x-1+x^2-4x+2x-8

(2x^2+x^2)+(2x-1x-4x+2x)+(-1-8)

(2+1)x^2+(2-1-4+2)x+(-9)

3x^2-1x-9