Question

Answer 1

Bài 2: 

a: =>2x=3

=>x=3/2

b: \(\Leftrightarrow x^2-2x+3=x^2-6x+9\)

=>4x=6

=>x=3/2

c: =>(2x-5)(2x+5)=0

=>x=5/2 hoặc x=-5/2

Answer 2

bạn đăng tách ra nhé 

a, \(=5x^2-13x-6-3x-21+5\left(9-x^2\right)=-16x-27+45=-16x+18\)

b, \(=4x^2-1-4x^2-12x-9+6x-3=-6x-13\)

c, \(=\left(x-3+x+3\right)\left(x^2-6x+9-2x^2+18+x^2+6x+9\right)=2x.36=72x\)

d, \(=x^2-4x+4-x^2+2x+15+2x-17=2\)