Question

 phân tích đa thức . x2 + 2x + 1 - 16 thành nhân tử

Answer 1

\(x^2+2x+1-16=\left(x+1\right)^2-4^2=\left(x+1-4\right).\left(x+1+4\right)=\left(x-3\right).\left(x+5\right)\)

Answer 2

\(x^2+2x+1-16=\left(x^2+2x+1\right)-4^2=\left(x+1\right)^2-4^2=\left(x+1-4\right)\left(x+1+4\right)=\left(x-3\right)\left(x+5\right)\)

Answer 3

\(x^2+2x+1-16=\left(x+5\right)\left(x-3\right)\)