Answer
$100x^{10}y^{12}$
Work Step by Step
RECALL:
The product rule of exponents states that: $a^m \cdot a^n=a^{m+n}$.
Multiply the numerical coefficients, and use the rule above to find:
$\\=100x^{3+7}y^{4+8}
\\=100x^{10}y^{12}$
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