Factoring
As you know 9 can be written as 32
25 = 52 and 49 =
answer
These numbers are known as perfect squares because they have one factor that can be multiplied by itself and your answer will be the original number. ex.   25 = 52
Trinomials can be perfect squares   t2 + 8t + 16 = (t + 4)(t + 4) = (t + 4)2
r2 - 12r + 36 = (r - 6)(r - 6) = (r - 6)2
Try these: