Question

PLEASE HURRY!!

Find f(-2) for f(x)=5*3^x

A: 1/45
B: -30
C: -45
D: 5/9

Answer 1

• We have to find the value of f(-2)

`\mapsto \: f(x) = {5.3}^(x)`

• Put x=-2

`\mapsto \: f( - 2) = {5.3}^( - 2)`

`\mapsto \: f( - 2) = 5 * \frac{1}{ {3}^(2) }`

`\mapsto \: f( - 2) = (5)/(9) = 0.5555..... \: or \: 0.56`

Answer 2

5/9

Explanation:

f(x)=5*3^x

Let x = -2

f(-2)=5*3^-2

= 5 * 1/3^2

= 5 * 1/9

= 5/9