Question

Estude o sinal destas funções:

a) f(x) = 3x-36

Answer 1

3x-36=0

3x=36

x=36/3

x=12

Answer 2

$<var>\rightarrow 3x - 36 = 0 \\ 3x = 36 \\ x = 12 \\\\ \text{Assim:} \\ \blacktriangleright \text{Para} \ x = 12, y = 0 \\ \blacktriangleright \text{Para} \ x < 12, y < 0 \\ \blacktriangleright \text{Para} \ x > 12, y > 0</var>$