x + y theory and x**y
x≠x+y This is true unless y= 0.
Q:x + x = x**2. y + y = y**2. y + x =?
A:2. x = 0. y = 2. 0 + 0 = 0. 0**2= 0 x 0 = 0. 0 = 0. 2 + 2 = 4. 2**2 = 4. 4 = 4. 2 + 0 = 2.
