Answer:

Step-by-step explanation:
Answer:
(2x+3) (2x-3)
Step-by-step explanation:
Both 4 and 9 have square roots and the problem is a difference of two squares. So if factored, one parenthesis will have a - and the other will have a +.
Answer:
I7.
Step-by-step explanation:
at r = 13,
r + 4 = 13 + 4 = 17