Question

ptích đa thức thành nhân tử

x²-x-12

Answer 1

\(x^2-x-12\)

\(=x^2-4x+3x-12\)

\(=\left(x^2-4x\right)+\left(3x-12\right)\)

\(=x\left(x-4\right)+3\left(x-4\right)\)

\(=\left(x+3\right)\left(x-4\right)\)

Answer 2

Answer 3

x² -x -12

=x²-4x+3x-12

=(x²-4x)+(3x-12)

=x(x-4)+3(x-4)

=(x-4)(x+3)