Question

6x² - (2x+5).(3x-2)=7

Answer 1

\(6x^2-\left(2x+5\right).\left(3x-2\right)=7\Leftrightarrow6x^2-\left(6x^2-4x+15x-10\right)=7\)

\(\Leftrightarrow6x^2-6x^2+4x-15x+10=7\Leftrightarrow4x-15x=7-10\)

\(\Leftrightarrow-11x=-3\Leftrightarrow x=\dfrac{-3}{-11}=\dfrac{3}{11}\) vậy \(x=\dfrac{3}{11}\)

Answer 2

\(6x^2-\left(2x+5\right)\left(3x-2\right)=7\)

\(\Rightarrow6x^2-2x\left(3x-2\right)-5\left(3x-2\right)=7\)

\(\Rightarrow6x^2-6x^2+4x-15x+10=7\)

\(\Rightarrow-11x+10=7\)

\(\Rightarrow-11x=-3\)

\(\Rightarrow x=\dfrac{3}{11}\)