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a/ \(\left(x+y\right)^2-8\left(x+y\right)+12\)
\(=\left(x+y\right)\left(x+y-8+12\right)\)
\(=\left(x+y\right)\left(x+y+4\right)\)
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b/\(\left(x^2+2x\right)^2-2x^2-4x-3\)
\(=\left(x^2+2x\right)^2-\left(2x^2+4x\right)-3\)
\(=\left(x^2+2x\right)^2-2\left(x^2+2x\right)-3\)
\(=\left(x^2+2x\right)\left(x^2+2x-5\right)\)
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c/ \(\left(x^2+x\right)^2-2\left(x^2+x\right)-15\)
\(=\left(x^2+x\right)\left(x^2+x-2-15\right)\)
\(=\left(x^2+x\right)\left(x^2+x-17\right)\)
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c: \(x^2-4+3\left(x-2\right)^2\)
\(=\left(x-2\right)\left(x+2\right)+\left(x-2\right)\left(3x-6\right)\)
\(=\left(x-2\right)\left(x+2+3x-6\right)\)
\(=\left(4x-4\right)\left(x-2\right)\)
\(=4\left(x-1\right)\left(x-2\right)\)
Ta có: \(a\left(x^2+1\right)-x\left(a^2+1\right)=ax^2+a-xa^2-x=ax\left(x-a\right)-\left(x-a\right)=\left(x-a\right)\left(ax-1\right)\)
\(=x^2a+a-xa^2-x=x\left(xa-1\right)+a\left(1-xa\right)=\left(x-a\right)\left(xa-1\right)\)
a: \(=\left(x+1\right)\left(x^2-x+1\right)+5x\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+4x+1\right)\)
a: (3x-5)^2-(x+3)^2
=(3x-5-x-3)(3x-5+x+3)
=(2x-8)(4x-2)
=2(x-4)*2*(2x-1)
=4(x-4)(2x-1)
b: (2x+1)^2-4(x-3)^2
=(2x+1)^2-[2*(x-3)]^2
=(2x+1)^2-(2x-6)^2
=(2x+1-2x+6)(2x+1+2x-6)
=(4x-5)*7
a) \(4\left(x+y\right)\)
b) \(\left(x-3y\right)^2\)
c) \(x^3-x-x^2+1=x\left(x^2-1\right)-\left(x^2-1\right)=\left(x^2-1\right)\left(x-1\right)=\left(x-1\right)\left(x+1\right)\left(x-1\right)\)
a) \(4 (x + y)\)
b) \((x - 3y)^2\)
c) \(x^3 - x - x^2 + 1 = x (x^2 - 1) - (x^2 - 1) = (x^2 - 1) (x - 1) = (x - 1) (x + 1) (x - 1)\)
a) \(4x^2\left(x+3\right)-8x\left(3+x\right)=4x\left(x+3\right)\left(x-2\right)\)
b) \(4x^2+y^2-25+4xy=\left(2x+y\right)^2-25=\left(2x+y-5\right)\left(2x+y+5\right)\)
c) \(\left(x-3\right)^2-\left(x+2\right)^2=\left(x-3-x-2\right)\left(x-3+x+2\right)=-5\left(2x-1\right)\)
a: =x(4x^2+4x+1)
=x(2x+1)^2
b: =(x-y)^2-49
=(x-y-7)(x-y+7)
Ta có : \(\left(x^2+x\right)^2-2\left(x^2+x\right)-15=\left[\left(x^2+x\right)-2\left(x^2+x\right)+1\right]-16=\left(x^2+x-1\right)^2-4^2\)
\(=\left(x^2+x-5\right)\left(x^2+x+3\right)\)