Question

1.Rút gọn

a)2x(2x-1)-(2x-1)^2-2x

b)(2x-3)(2x+3)-(2x+2)^2

c)(3x-2)^2-2(3x-2)(3x+1)+(3x+1)^2

Answer 1

a: \(=4x^2-2x-4x^2+4x-1-2x=-1\)

b: \(=4x^2-9-4x^2-8x-4=-8x-13\)

c: \(=\left(3x-2-3x-1\right)^2=\left(-3\right)^2=9\)

Answer 2

\(a,=4x^2-2x-4x^2+4x-1-2x=-1\\ b,=4x^2-9-4x^2-8x-4=-8x-13\\ c,=\left[\left(3x-2\right)-\left(3x+1\right)\right]^2=\left(3x-2-3x-1\right)^2=\left(-3\right)^2=9\)