e=√d/ab make d the subject ,do not include the bracket .thanks
or, as we say in English, "solve for d"
e = √d/ab
eab = √d
(eab)^2 = d
if you were careless with parentheses, and meant
e = √(d/ab)
e^2 = d/ab
abe^2 = d
e = √d/ab
eab = √d
(eab)^2 = d
if you were careless with parentheses, and meant
e = √(d/ab)
e^2 = d/ab
abe^2 = d