Question

`(9b+3)^(2)`

Answer 1

81b^2 + 54b + 9

Explanation:

(9b+3)^2=

(9b+3)(9b+3)=

9b(9b+3) + 3(9b+3) =

(9b*9b + 3*9b) + (3*9b + 3*3)=

9*9*b*b + 27b + 27b + 9 = 81b^2 + 54b + 9

Answer 2

For this question, you should use the formula (x+y)^2 = x^2+2xy+y^2, which in this case, x=9b and y=3. Feel free to clarify if you don’t understand!