Question

What is the value of f(x) = 9x when x = -2? i think its 1/81

Answer 1

$\text{We know:} \ \\ \\ f(x) = 9x \\ \\ \text{when x = -2 we have :} \\ \\ f(-2) = 9 \cdot (-2) \\ \\ f(-2)=-18$