Question

Answer 1

b: \(=\left(x-8\right)\left(x+7\right)\)

d: \(=-x^2+7x-3x+21\)

\(=-x\left(x-7\right)-3\left(x-7\right)=\left(x-7\right)\left(-x-3\right)\)

 

Answer 2

\(b,=\left(x-8\right)\left(x+7\right)\)

\(d,=-\left(x^2-4x+4\right)+25=5^2-\left(x-2\right)^2=\left(3-x\right)\left(7+x\right)\)