a: =>2x^2-10x-3x-2x^2=26
=>-13x=26
=>x=-2
b: =>(2x-3-x-5)(2x-3+x+5)=0
=>(x-8)(3x+2)=0
=>x=8 hoặc x=-2/3
f: =>(x-3)(x+2)=0
=>x=3 hoặc x=-2
e: =>3x(x^2-16)=0
=>x(x-4)(x+4)=0
hay \(x\in\left\{0;4;-4\right\}\)
g: =>(x+5)(2-x)=0
=>x=2 hoặc x=-5
h: =>x^3+x^2-4x-4=0
=>(x+1)(x^2-4)=0
=>\(x\in\left\{-1;2;-2\right\}\)