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a) \(3x^2-3y^2=3\left(x^2-y^2\right)=3\left(x-y\right)\left(x+y\right)\)
b) \(x^2-xy+7x-7y=\left(x^2+7x\right)-\left(xy+7y\right)\)
\(=x\left(x+7\right)-x\left(y+7\right)=x\left(x+7-y-7\right)=x\left(x-y\right)\)
c)\(x^2-3x+2=x^2-2x-x+2=\left(x^2-x\right)-\left(2x-2\right)\)
\(=x\left(x-1\right)-2\left(x-1\right)=\left(x-2\right)\left(x-1\right)\)
d) \(x^3+2x^2y+xy^2-16x=x\left(x^2+2xy+y^2-16\right)\)
\(=x\left[\left(x+y\right)^2-16\right]=x\left(x+y-4\right)\left(x+y+4\right)\)
a) \(x^3-2x^2+x+xy^2\)
\(=x\left(x^2-2x+1+y^2\right)\)
\(=x\left[\left(x-1\right)^2+y^2\right]\)
\(=-x\left[\left(x-1\right)^2-y^2\right]\)
\(=-x\left(x-1+y\right)\left(x-1-y\right)\)
b) \(4x^2+16x+16\)
\(=4\left(x^2+4x+4\right)\)
\(=4\left(x+2\right)^2\)
a,x4-4x3+8x2-16x+16
=(x4-4x3+4x2)+(4x2-16x+16)
=(x^2-2x)^2+(2x-4)^2
=x^2(x-2)^2+4(x-2)^2
=(x-2)^2(x^2+4)
\(x\left(x-3\right)+y\left(x-3\right)\)
\(\left(x-3\right)\left(x+y\right)\)
k giúp mình nhé , mình k lại
\(x^2+3x+3y+xy=x^2+xy+3x+3y=x.\left(x+y\right)+3.\left(x+y\right)\) \(=\left(x+3\right)\left(x+y\right)\)
\(x^2+5x^2+6x=x^2+x+5x^2+5x=x\left(x+1\right)+5x\left(x+1\right)\) \(=\left(x+5x\right)\left(x+1\right)=6x\left(x+1\right)\)
a)\(x^2+3x+3y+xy\)
\(=x\left(x+y\right)+3\left(x+y\right)\)
\(=\left(x+3\right)\left(x+y\right)\)
ĐẸP BẰNG CÁI NÀY KO
\(xy^2-16x-48y+3y^2\)
\(=x\left(y^2-16\right)+3\left(y^2-16\right)\)
\(=\left(x+3\right)\left(y+4\right)\left(y-4\right)\)