When is g(x)=0 for the function g(x)=5*2^(3x)+4?

2 Answers
Nov 8, 2016

If g(x)=5 * 2^(3x)+4
then g(x) is never =0

Explanation:

For any positive value k and any Real value p
color(white)("XXX")k^p > 0

Therefore
color(white)("XXX")2^(3x) > 0 for AAx in RR

and
color(white)("XXX")rarr 5*2^(3x) > 0 for AAx in RR

and
color(white)("XXX")rarr 5*2(3x)+4 > 0 for AAx in RR

Nov 8, 2016

For this function, g(x) != 0.

Explanation:

This is an exponential function, and, generally, exponential functions have no y-value equal to 0. This is because no exponent of any number will give you 0 (or anything smaller than it).

The only way to have an exponential function which intercepts the x-axis is the translate the graph downwards.