\(x^2-4-\left(x+2\right)=x^2-4-\left(x+2\right)=x^2-2^2-\left(x+2\right)=\left(x-2\right).\left(x+2\right)-1.\left(x+2\right)=\left(x+2\right).\left(x-2-1\right)=\left(x+2\right).\left(x-1\right)\)
lần sau bạn nhớ ghi rõ đề bài là gj nhé:>
vì mình ko bt nên mk coi nó là bài phân tích đa thức thành nhân tử:3
chúc bạn hok tốt:))
\(x^2-4-\left(x+2\right)\\ =\left(x+2\right)\left(x-2\right)-\left(x+2\right)\\ =\left(x+2\right)\left(x-2-1\right)\\ =\left(x+2\right)\left(x-3\right)\)
\(x^2-4-\left(x+2\right)\)
\(=\left(x^2-4\right)-\left(x+2\right)\)
\(=\left(x+2\right)\left(x-2\right)-\left(x+2\right)\)
\(=\left(x+2\right)\left(x-3\right)\)
\(x^2-4-\left(x+2\right)=\left(x+2\right)\cdot\left(x-3\right)\)