The terms in this question are like so you can simply add them together.
15b2 + b2 = 16b2
Let's just test this (let b = 2)!
(15 * 22) + 22 = (15 * 4) + 4 = 64
16 * 22 = 16 * 4 = 64
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(a + 2 - b) (a + 2 + b)
b + b + b + 7 = 223b + 7 = 223b = 15b = 5
b= 10
b = 14324.80366
The Pythagoream Thereom is a^2 + b^2 = c^2. Written out it is a squared plus b squared equals c squared.