\(a)\)\(3x^2-6xy+3y^2-12\)
\(=\)\(3\left(x^2-2xy+y^2\right)-12\)
\(=\)\(3\left(x-y\right)^2-12\)
\(=\)\(3\left[\left(x-y\right)^2-4\right]\)
\(=\)\(3\left(x-y-4\right)\left(x-y+4\right)\)
\(b)\)\(x^2+5x+6\)
\(=\)\(\left(x^2+2x\right)+\left(3x+6\right)\)
\(=\)\(x\left(x+2\right)+3\left(x+2\right)\)
\(=\)\(\left(x+2\right)\left(x+3\right)\)
Chúc bạn học tốt ~
a) 3x2-6xy+3y2-12=3(x2-2xy+y2)-12=3(x-y)2-12=3[(x-y)2-4]=3(x-y-2)(x-y+2)
b)x2+3x+2x+6=x(x+3)+2(x+3)=(x+3)(x+2)
aaaaaa.. nhầm đoạn cuối bn êi :v
\(=\)\(3\left(x-y-2\right)\left(x-y+2\right)\) mới đúng nhé =.=
.
\(x^2+5x+6\)
\(=x^2+2x+3x+6\)
\(=x\left(x+2\right)+3\left(x+2\right)\)
\(=\left(x+2\right)\left(x+3\right)\)
c) 2x2(x +1) + 4x(x +1); d) 2 x(y - 1) - 2
