Question

tìm x biết

(2x-3)²-(x-3)(x+3)=(3x-1)(x+2)-15x

Answer 1

\(\Rightarrow4x^2-12x+9-x^2+9=3x^2+5x-2-15x\\ \Rightarrow-2x=-20\Rightarrow x=10\)

Answer 2

\(\Leftrightarrow4x^2-12x+9-x^2+9=3x^2+5x-2-15x\)

\(\Leftrightarrow-2x=-20\Leftrightarrow x=10\)

Answer 3

Ta có: \(\left(2x-3\right)^2-\left(x-3\right)\left(x+3\right)=\left(3x-1\right)\left(x+2\right)-15x\)

\(\Leftrightarrow4x^2-12x+9-x^2+9=3x^2+6x-x-2-15x\)

\(\Leftrightarrow-12x+18=-10x-2\)

\(\Leftrightarrow x=10\)