Question

\(3) 5x - 4(6-x)(x + 3) = (4-2x)(3-2x) + 2\)

Giải pt

Answer 1

\(5x-4\left(6x+18-x^2-3x\right)=\left(12-8x-6x+4x^2\right)+2\)

\(\Leftrightarrow5x-4\left(-x^2+3x+18\right)=\left(4x^2-14x+12\right)+2\)

\(\Leftrightarrow4x^2-7x-72=4x^2-14x+14\Leftrightarrow7x=86\Leftrightarrow x=\dfrac{86}{7}\)