Question

simplify the expression by combining like terms :

2b + 7b^2 - 2 + 3b - 1 + b

what's da number that go n the box?

( ? ) b^2 + ( ? ) b + ( ? )

Answer 1

Here is your answer:

2b + 7b^2 - 2 + 3b - 1 + b
Combine 2b and 3b
2b+3b=5b
Then do the exponent rule:
7×7=49b
Which equals:

(5b) b^2 + ( 2 ) b + (4b)