Question

Tìm x:

2*(5x - 8) - 3 (4x - 5) = 4*(3x - 4 ) + 11

(2x + 3)*(x - 4) + (x - 5)*(x - 2) = ( 3x - 4 ) * ( x - 4 )

Answer 1

\(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)

\(\Leftrightarrow10x-16-12x+15=12x-16+11\)

\(\Leftrightarrow-2x-1=12x-5\Leftrightarrow-14x=-4\Leftrightarrow x=\frac{2}{7}\)

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

\(\Leftrightarrow2x^2-8x+3x-12+x^2-2x-5x+10=3x^2-12x-4x+16\)

\(\Leftrightarrow3x^2-12x-2=3x^2-16x+16\)

\(\Leftrightarrow4x=18\Leftrightarrow x=\frac{9}{2}\)