Answer:
(x+4)(x+4) or (x+4)^2
Step-by-step explanation:
First look at 8x and 16.
You have to find what two numbers that multiply to give 16, and add up to 8.
4 x 4=16
4+4=8
Now, for x^2, these two can separate to give x·x
So, the final answer will be (x+4)(x+4) or (x+4)^2
