Question

Answer 1

c: \(=x\left(x-y\right)+5\left(x-y\right)=\left(x-y\right)\left(x+5\right)\)

d: \(=\left(x^2+4\right)\left(x^2-1\right)=\left(x^2+4\right)\left(x-1\right)\left(x+1\right)\)

Answer 2

\(x^2-5y-xy+5x\)

=\(x\left(x-y\right)+5\left(x-y\right)=\left(x-y\right)\left(x+5\right)\)