Question

resolva a inequação (-x+4).(-3x-12)>0

Answer 1

(-x+4).(-3x-12) > 0

3x²+12x-12x-48 > 0

3x²-48 > 0

3x² > 48

 x² > 48/3

 x² > 16

 x > +-16

S= {x ∈ R | x > +-16}