It is known that if the rational number satisfies (M + n / 4) ^ 2 + | n ^ 2-4 | = 0, what is the square value of square n of M

It is known that if the rational number satisfies (M + n / 4) ^ 2 + | n ^ 2-4 | = 0, what is the square value of square n of M

Set of equations m + n / 4 = 0
n^2-4=0
It is concluded that n ^ 2 = 4
m^2=1/4