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1) \(5x^2-5xy-9x+9y\)
\(=5x\left(x-y\right)-9\left(x-y\right)\)
\(=\left(5x-9\right)\left(x-y\right)\)
2) \(m^3+4m^2+3m\)
\(=m^3+3m^2+m^2+3m\)
\(=m^2.\left(m+3\right)+m\left(m+3\right)\)
\(=\left(m^2+m\right)\left(m+3\right)\)
\(=m\left(m+1\right)\left(m+3\right)\)
3) \(x^2-2xy-15y^2\)
\(=x^2-2xy+y^2-16y^2\)
\(=\left(x-y\right)^2-\left(4y\right)^2\)
\(=\left(x-y-4y\right)\left(x-y+4y\right)\)
Ta có :
a3m+2a2m+am
= am(a2m+2am+1)
= am[(am)2+2am+1]
= am(am+1)2
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
\(\left(3x-1\right)^2-\left(x+3\right)^2\)
\(=\left(3x-1+x+3\right)\left(3x-1-x-3\right)\)
\(=\left(4x+2\right)\left(2x-4\right)\)
\(=4\left(2x+1\right)\left(x-2\right)\)
\(x^2-y^2+4x+4\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2+y\right)\left(x+2-y\right)\)
\(4x^2-y^2+8\left(y-2\right)\)
\(=4x^2-\left(y^2-8y+16\right)\)
\(=4x^2-\left(y-4\right)^2\)
\(=\left(2x+y-4\right)\left(2x-y+4\right)\)
x3 - 3x2 - 3x - 1 -y3
= (x3 - y3) - (3x2 + 3x) - 1
= [(x-y)x2 + (x-y)xy + (x-y)y2 ] - 3x(x+1) -1
= (x-y)(x2+xy+y2) - 3x(x+1) - 1
\(15m^3-5m^2+7m\left(1-3m\right)\)
\(=5m^2\left(3m-1\right)-7m\left(3m-1\right)\)
\(=\left(5m^2-7m\right)\left(3m-1\right)=m\left(5m-7\right)\left(3m-1\right)\)