Factor 26r3s + 52r5 – 39r2s4. What is the resulting expression?

The greatest common factor of the terms is 13r²: the coefficients share 13, and each term contains at least r². Dividing each term by 13r² gives 2rs, 4r³, and −3s⁴, so the factored expression is 13r²(2rs + 4r³ − 3s⁴). Choice C matches.

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