Two squares are such that the sum of their areas are 11m^2 and the difference of their area are 7m^2. Find the length of a side of each square.

this is what i attempted and i think it's sort of right

( A * B ) + ( A * B ) = 11m^2

( A * B ) - ( A * B ) = 7m^2

2a + 2b = sqrt 11 = 3.316

2a - 2b = sqrt 7 = 2.645