Question

Tìm x, biết:

\(2x\left(x-5\right)-x\left(3+2x\right)=26\)

Answer 1

\(2x^2-10x-3x-2x^2=26\)

\(2x^2-13x-2x^2=26\)

\(-13x=26\)

\(x=-2\)

Answer 2

\(2x\left(x-5\right)-x\left(3+2x\right)=26\)

\(\Leftrightarrow\left(2x^2-10x\right)-\left(3x+2x^2\right)=26\)

\(\Leftrightarrow-13x=26\)

\(\Leftrightarrow x=-2\)