Question

What is the range of the exponential function shown below?

f(x) = 2 •7*
A. All real numbers
B. y<0
C. All real numbers except 2
D. y> 0

Answer 1

D

Explanation:

your function is not very clear but I'm assuming it's 2 multiplied by 7^x

first let y be equal to the function

to find the range interchange x and y and make the subject

at some point you'll have to use logarithm to get rid of the exponent

only log of positive numbers numbers exist hence y must be greater than 0