Question

Tìm x biết :

-4x( x - 5) - 2x( 8 - 2x)= -3

Answer 1

\(-4x\left(x-5\right)-2x\left(8-2x\right)=-3\)

⇔ \(-4x^2+20x-16x+4x^2=-3\)

⇔ \(4x=-3\)

\(\text{⇔}x=-\dfrac{3}{4}\)

KL........

Answer 2

\(-4x\left(x-5\right)-2x\left(8-2x\right)=-3< =>-4x\left(x-5\right)-4x\left(4-x\right)=-3< =>-4x\left(x-5+4-x\right)=-3< =>x=-\dfrac{3}{4}\)