I'm taking a university math course despite knowing better. Among the straightforward problems I encountered the following:
Simplify:
$$5^x +5^{x+2}$$
The answer is supposed to be $26*5^x$
How am I supposed to arrive at this conclusion, do I interpret this as some kind of short geometric sum?
$5^{x}+5^{x+2}=5^{x}+5^{x}\cdot 5^{2}=5^{x}(1+5^{2})=5^{x}\cdot 26$