In your notebook, set up the following addition using a vertical format and find the sum of the given polynomials.

7b + 3, -4b + 5, and -3b + 2

10b + 2
10
0
b - 8

7b + 3
-4b + 5
-3b + 2

If you add the negatives first by combining like terms, you'll get...

(-4b + 5) + (-3b + 2) = -7b + 7

Then do...

(-7b + 7) + (7b + 3) = 10

The reason is just 10 is because 7 + 3 = 10 and then the negative 7 and the positive 7 will cancel out and make 0b aka just 0 which leaves you with 10 as your answer.