Answer:
(+3)(+5)
Step-by-step explanation:
Let's factor a2+8a+15
a2+8a+15
The middle number is 8 and the last number is 15.
Factoring means we want something like
(a+_)(a+_)
Which numbers go in the blanks?
We need two numbers that...
Add together to get 8
Multiply together to get 15
Can you think of the two numbers?
Try 3 and 5:
3+5 = 8
3*5 = 15
Fill in the blanks in
(a+_)(a+_)
with 3 and 5 to get...
(a+3)(a+5)
