Question

Phân tích đa thức thành nhân tử : x² - 2x - 24

Answer 1

\(x^2-2x-24\)

\(=x^2-6x+4x-24\)

\(=x(x-6)+4(x-6)\)

\(=(x+4)(x-6)\)

Answer 2

\(x^2-2x-24\\ =x^2-2x+1-25\\ =\left(x-1\right)^2-5^2\\ =\left(x-1-5\right)\left(x-1+5\right)\\ =\left(x-6\right)\left(x+4\right)\)

Answer 3

\(x^2-2x-24=\left(x-6\right)\left(x+4\right)\)