Answer:
< B = 94
Explanation:
Remark
You should edit the question. The way you wrote it, , it looks like you have to square two binomials. That isn't the way it is given I don't think. You are told that A and B are supplementary. That means
A+B = 180
Equation
(8x + 6) + (7x + 24) = 180 Remove the brackets
Solution
8x + 6 + 7x + 24 = 180 Collect like terms
15x + 30 = 180 Subtract 30 from both sides
15x = 180 - 30
15x = 150 Divide by 15
x = 150 / 15
x = 10
Answer
What you need is <B
<B = 7x + 24
<B = 7*10 + 24
<B = 70 + 24
<B = 94