When multiplying terms that have the same base (in this case, ) but different exponents, you can add their exponents to make them one term.
In this case, we can add the exponents of :
A simplified version is .
When you multiply bases with powers and the bases are the same you get to add the powers. All the bases are x. So the bases are the same. That means you get to add the powers. Latex will help you understand what I'm saying.
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