Please find the value of A and B​

Here's a photo of the solution. Hope this helps and please give brainlist!

For B :

For A :

but b is 14:

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.