Question

Tìm x biết           (2x+1).(x^2-x)+x.(5+x-2x^2)=    3x+7            trả lời chi tiết giúp mik nhe

Answer 1

\(\left(2x+1\right)\left(x^2-x\right)+x\left(5+x-2x^2\right)=3x+7\)

\(2x^3-2x^2+x^2-x+5x+x^2-2x^3=3x+7\)

\(5x-x=3x+7\)

\(4x-3x=7\)

\(x=7\)

Answer 2

(2x+1)(x^2-x)+x(-2x^2+x+5)=3x+7

=>2x^3-2x^2+x^2-x-2x^3+x^2+5x=3x+7

=>-x^2-x+x^2+5x=3x+7

=>4x=3x+7

=>x=7