Chapter 10 - Section 10.4 - Introduction to Factoring Polynomials - Exercise Set - Page 722: 9

$y^2$

$y^7=\underline{y}\times \underline{y}\times y\times y\times y\times y\times y$ $y^2=\underline{y}\times \underline{y}$ $y^{10}=\underline{y}\times \underline{y}\times y\times y\times y\times y\times y\times y\times y\times y$ $GCF=y\times y= y^2$