Question

Tìm x

(2x-1)^3-4x^2(2x-3)=5

(x+4)^3_x^2(X+12)=15

6(x+1)+2(x-1)(x^2+x+1)-2(x+1)^3+32

Answer 1

\(\left(2x-1\right)^3-4x^2\left(2x-3\right)=5.\)

\(\Leftrightarrow8x^3-12x^2+6x-1-8x^3+12x^2=5\)

\(\Leftrightarrow6x-1=5\)

\(\Leftrightarrow6x=6\)

\(\Leftrightarrow x=1\)

Answer 2

\(\left(x+4\right)^3-x^2\left(x+12\right)=15.\)

\(\Leftrightarrow x^3+12x^2+48x+64-x^3-12x^2=15\)

\(\Leftrightarrow48x+64=15\)

\(\Leftrightarrow48x=-49\)

\(\Leftrightarrow x=\frac{-49}{48}\)