Question

tìm x biết :
2x^2-3(1-x).(x+1)=5x(x+1)
 

Answer 1

Link : Tìm x biết 2x^2+3(x-1)(x+1)=5x(x+1)

Answer 2

\(2x^2-3\left(1-x\right)\left(x+1\right)=5x\left(x+1\right)\\ \Leftrightarrow2x^2+3\left(x^2-1\right)=5x^2+5x\\ \Leftrightarrow2x^2+3x^2-3=5x^2+5x\\ \Leftrightarrow x=-\dfrac{3}{5}\\ \Rightarrow S=\left\{-\dfrac{3}{5}\right\}\)

Answer 3

Ta có: \(2x^2-3\left(1-x\right)\left(x+1\right)=5x\left(x+1\right)\)

\(\Leftrightarrow2x^2+3x^2-3-5x^2-5x=0\)

\(\Leftrightarrow-5x=3\)

hay \(x=-\dfrac{3}{5}\)