Question

Quanto da 3x - 4 . (x-2) > x + 4?

Answer 1

$3x - 4 \cdot (x-2) \ \textgreater \ x + 4\\ \\ 3x - 4x+8 \ \textgreater \ x + 4\\ \\ 3x - 4x-x \ \textgreater \ 4-8\\ \\ -2x \ \textgreater \ -4\ \ \ \times(-1)\\ \\ 2x \ \textless \ 4\\ \\x\ \textless \ \frac{4}{2} \\ \\x\ \textless \ 2$
S = {x ∈ IR| x < 2}