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

13 (2r3s + 4r5 - 3r2s4)

13r2s (2r + 4r3 - 3s3)

13r2 (2rs + 4r3 - 3s4)

13r2 (26r3s + 52r5 - 39r2s4)

In factoring polynomials, determine first the greatest common factor of the terms. The greatest common factor of the numerical coefficients of the terms is 13. Another factor common to these terms is r^2. These make the GCF equal to 13r^2. Thus, factoring the polynomial,

13r^2 (2rs + 4r^3 - 3s^4)

Hence, the answer is the third choice.