Question 576663
Well, you can't solve this "equation" because it is not an equation! It's an expression.
In an equation, you must have an equals (=) sign.
Now if you meant to write:
{{{4d^2-25 = 0}}} then you can solve this!
{{{4d^2-25 = 0}}} Add 25 to both sides of the equation.
{{{4d^2 = 25}}} Now take the square root of both sides.
{{{2d = 5}}} or {{{2d = -5}}} Divide these by 2.
{{{d = 5/2}}} or {{{d = -5/2}}}