(5x-4)2-49x2
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\(x^4-5x^2+4=\left(x^2-4\right)\left(x^2-1\right)=\left(x-2\right)\left(x+2\right)\left(x-1\right)\left(x+1\right)\)
Ta có: \(5x^2-10x+2x-4\)
\(=5x\left(x-2\right)+2\left(x-2\right)\)
=(x-2)(5x+2)
\(A=5x^3-125x=5x\left(x-5\right)\left(x+5\right)\)
\(B=x^3-8+\left(x-2\right)\left(5x+4\right)\)
\(=\left(x-2\right)\left(x^2+2x+4+5x+4\right)\)
\(=\left(x-2\right)\left(x+2\right)\left(x+4\right)\)
a: \(=\left(x+1\right)\left(x^2-x+1\right)+5x\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+4x+1\right)\)
\(5x^2-10x+2x-4\)
\(=5x\left(x-2\right)+2\left(x-2\right)\)
\(=\left(x-2\right)\left(5x+2\right)\)
\(\left(5x-4\right)^2-49x^2\)
\(=\left(5x-4\right)^2-\left(7x\right)^2\)
\(=\left(5x-4-7\right)\left(5x-4+7\right)\)
\(=\left(5x-11\right)\left(5x+3\right)\)
(5x-4)2-(7x)2
= (5x-4-7x)(5x-4+7x)
= (-2x-4)(12x-4)
= -8(x+2)(3x-1)