Question

Phân tích thành nhân tử

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

\(x^2 -16y^2 +4x+4\)

\(3x^2 +6xy+3y^2 -12\)

\(4x^3 +4x^2 +x\)

Answer 1

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

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

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

\(---\)

\(x^2-16y^2+4x+4\)

\(=\left(x^2+4x+4\right)-16y^2\)

\(=\left(x+2\right)^2-\left(4y\right)^2\)

\(=\left(x+2-4y\right)\left(x+2+4y\right)\)

\(=\left(x-4y+2\right)\left(x+4y+2\right)\)

\(---\)

\(3x^2+6xy+3y^2-12\)

\(=3\left(x^2+2xy+y^2-4\right)\)

\(=3\left[\left(x+y\right)^2-2^2\right]\)

\(=3\left(x+y-2\right)\left(x+y+2\right)\)

\(---\)

\(4x^3+4x^2+x\)

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

\(=x\left(2x+1\right)^2\)