#### Answer

Sample answer:
a. $y^{2}+12y+36$
b. Because
1. the first term, $y^{2}$ is a square
2. so is the last term, $6^{2}$,
and
3. the middle term is $2(y)(6)$.

#### Work Step by Step

a. $y^{2}+12y+36$
b. Because
1. the first term, $y^{2}$ is a square
2. so is the last term, $6^{2}$,
and
3. the middle term is $2(y)(6)$.