Question

Answer 1

a: =(x+7)(x-1)

b: =3x^2-9x-x+3

=(x-3)(3x-1)

c: \(=\left(2x^2-8\right)^2-18\left(x^2-4\right)\)

\(=4\left(x^2-4\right)^2-18\left(x^2-4\right)\)

\(=2\left(x^2-4\right)\left(x^2-4-9\right)\)

\(=2\left(x^2-4\right)\left(x^2-13\right)\)

\(=2\left(x-2\right)\left(x+2\right)\left(x^2-13\right)\)