Given M-N = 1 / 2, then the value of the algebraic formula (M + n) ² - 4Mn is

Given M-N = 1 / 2, then the value of the algebraic formula (M + n) ² - 4Mn is

(m+n)²-4mn
=m^2+2mn+n^2-4mn
=m^2-2mn+n^2
=(m-n)^2
=(1/2)^2
=1/4