Question

Find f(-2) for f(x) = 5•3^x
А. 1/45
B. -45
C.-30
D. 5/9

Answer 1

`f(x) = 5 \cdot 3^x\\\\\\f(-2) = 5\cdot 3^(-2)\\\\~~~~~~~~~=5\cdot \frac 1{3^2}\\\\~~~~~~~~~=\frac 59\\\\\text{Hence the answer is D.}`