When multiplying two powers that have the same base ($r$), you can add the exponents
$gr^2afica\ln\left(xy-1\right)$
2
When multiplying two powers that have the same base ($a$), you can add the exponents
$gr^2a^2fic\ln\left(xy-1\right)$
Final answer to the problem
$gr^2a^2fic\ln\left(xy-1\right)$
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The simplification of algebraic expressions consists in rewriting a long and complex expression in an equivalent, but much simpler expression. This simplification can be accomplished through the combined use of arithmetic and algebra rules.