Question

\(x^3+3x^2+1-3x\)

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

\(x^2-2x-15\)

\(2x^2+3x-5\)

\(2x^2-18\)

\(x^2-7xy+10y^2\)

 

Answer 1

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

\(\:dong3\\ =2x^2+3x-2-3=2 x\left(x-1\right)+3\left(x-1\right)=\left(2x+3\right)\left(x-1\right)\)

\(2x^2-18=2\left(x^2-9\right)\)

\(x^2-7xy+10y^2=\)

Answer 2

câu 5 

2x²-18

=2(x²-9)

=2(x-3)(x+3)

Answer 3

câu cuối mk biết làm rồi

\(x^2-7xy+10y^2\)

\(=x^2-2xy-5xy+10x^2\)

\(=\left(x-5y\right)\left(x-2y\right)\)