Question

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

tính

Answer 1

\(\left(3x-2\right)^2-2\left(x-1\right)^2\)

\(=9x^2-18x+4-2\left(x^2-2x+1\right)\)

\(=9x^2-18x+4-2x^2+4x-2\)

\(=7x^2-14x+2\)

Answer 2

\(\left(3x-2\right)^2-2\left(x-1\right)^2=9x^2-12x+4-2x^2+4x-2=7x^2-8x+2\)

Answer 3

\(=9x^2-12x+4-2x^2+4x-2\\ =7x^2-8x+2\)

Answer 4