a² +b²=52
a-b=26
a+b=?
A=?
b=?
Here, I'll help you get started:
let a + b = x
26x = a^2 - b^2
We have a^2 + b^2 = 52
-2b^2 = 26x - 52
b^2 = 26 - 13x
a^2 = 26 + 13x
+311 
