Question

3- Calcule a raiz da função:

a) y = - 15 b) f(x) = - 4x

c) f(x) = 7x + 12

Answer 1

$a) \: y = - 15 \\ y + 15 = - 15 + 15 \\ y + 15 = 0$

$b) \: f(x) = - 4x \\ 0 = - 4x \\ - 4x = 0 \\ x = 0$

$f(x) = 7x + 12 \\ 0 = 7x + 12 \\ - 7x = 12 \\ x = - \frac{12}{7}$