Dạng 2:
a: \(\Leftrightarrow9x^2-24x+16-9\left(x^2-4x+3\right)=13\)
=>9x^2-24x+16-9x^2+36x-27=13
=>12x-11=13
=>x=2
b: \(\Leftrightarrow4x^2+4x+9-4x^2=15\)
=>4x=6
=>x=3/2
c: \(\Leftrightarrow x^3-3x^2+3x-1+3x^2-12x+1=0\)
=>x^3-9x=0
=>\(x\in\left\{0;3;-3\right\}\)
d: =>(x+5)(2-x)=0
=>x=-5 hoặc x=2
e: =>3x(x^2-25)=0
=>x(x-5)(x+5)=0
=>\(x\in\left\{0;5;-5\right\}\)
f: =>(3x-2)(3x+2)-2(3x-2)^2=0
=>(3x-2)(3x+2-6x+4)=0
=>(3x-2)(-3x+6)=0
=>x=2 hoặc x=2/3
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