linear equations

2.   4x²-2(a²+b²)x+a²b²=0  divide whole eqn. by 4 we get    x²-(a²+b²)x /2 +a²b² /4 =0

we can write the expression as (x - a² / 2) (x - b² /2) = 0  so we get roots of the above eqn. as x = a² /2 , b² / 2