Evaluate the exponential function f(x)=20^x

Question

f(3)= ______

f(−2)=______

f(12)________

Answer 1

Hi! The number in the parentheses of the function f(x) is the number that you substitute for x in the given function. So . . .

f(3) = 20^3 = 20*20+20 = 8000

It may also be that the question writer wanted the answer in the form of an exponent, and this is how to do that:

20 = 2^2* 5, so 20^3 = (2^2)^3 * 5^3 = 2^6 * 5^3

f(-2) = 1/f(2) = 1/20^2 = 1/400

f(12) = 20^12 = 4,096,000,000,000,000 or 4.096 x 10^15

Hope that helps!