Question

17. (5a+ 6)2 =

A. 25a2+ 36
B. 25a2- 36
C. 25a2+ 30a + 36
D. 25a2 + 60a +36

Show Your Work

Answer 1

D. 25a² +60a +36

Explanation:

You have memorized the form ...

(p +q)² = p² +2pq +q²

so you can write down immediately the result for p=5a and q=6:

(5a)² +2(5a)(6) +6² = 25a² +60a +36