Question

Tìm x sao cho

(x+5)(4-3x)-(3x+2)²+(3x+2)³=(2x-1)(4x²+2x+1)

Answer 1

\(\Leftrightarrow4x-3x^2+20-15x-9x^2-12x-4+\left(3x+2\right)^3=8x^3-1\)

\(\Leftrightarrow-12x^2-23x+16+27x^3+54x^2+36x+8=8x^3-1\)

\(\Leftrightarrow27x^3+42x^2+13x+24-8x^3+1=0\)

\(\Leftrightarrow19x^3+42x^2+12x+25=0\)