Question

rút gọn biểu thức \(\left(5-3x\right)^2+\left(x+2\right)^2+x\left(3-4x\right)\)

Answer 1

\(\left(3x-5\right)^2+\left(x+2\right)^2+x\left(3-4x\right)\)

\(=9x^2-30x+25+x^2+4x+4+3x-4x^2\)

\(=6x^2-23x+29\)

Answer 2

\(=25-30x+9x^2+x^2+4x+4+3x-12x^2=-2x^2-23x+29\)