Question

Answer 1

a: =(x+5)(x^2-5x+25)-x(x+5)

=(x+5)(x^2-6x+25)

b: \(=\left(x^2+7x+12\right)\left(x^2+7x+10\right)-8\)

\(=\left(x^2+7x\right)^2+22\left(x^2+7x\right)+112\)

\(=\left(x^2+7x+6\right)\left(x^2+7x+16\right)\)

\(=\left(x+1\right)\left(x+6\right)\left(x^2+7x+16\right)\)