Question

rút gọn (2x-1)(x+2)-(x-3)(x+3)

Answer 1

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

\(=2x^2+3x-2-x^2+9\)

\(=x^2+3x+7\)

Answer 2

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

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

\(=x^2+3x+7\)

Answer 3

\(2x^2+4x-x-2-x^2+9=x^2+3x+7\)