Bài 2:
a: =(x-y)(x^2+2)
b: \(=25x^2-4y^2+4y-1\)
\(=25x^2-\left(2y-1\right)^2\)
\(=\left(5x-2y+1\right)\left(5x+2y-1\right)\)
Bài 3:
a: \(x\left(2x-3\right)-2\left(3-2x\right)=0\)
=>(2x-3)(x+2)=0
=>x=3/2 hoặc x=-2
b: \(\Leftrightarrow x^2+x+\dfrac{1}{4}-x^2-6x-\dfrac{1}{2}x-3=8\)
=>-11/2x-11/4=8
=>-11/2x=8+11/4=43/4
=>x=-43/4:11/2=-43/4*2/11=-86/44=-43/22
c: \(\Leftrightarrow\left(x^2+2x\right)^2-2\left(x^2+2x\right)-3=0\)
=>(x^2+2x-3)(x^2+2x+1)=0
=>x=-1; x=-3; x=1
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