a^2+400-625=0

Solution for a^2+400-625=0 equation:

Simplifying
a2 + 400 + -625 = 0

Reorder the terms:
400 + -625 + a2 = 0

Combine like terms: 400 + -625 = -225
-225 + a2 = 0

Solving
-225 + a2 = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '225' to each side of the equation.
-225 + 225 + a2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + a2 = 0 + 225
a2 = 0 + 225

Combine like terms: 0 + 225 = 225
a2 = 225

Simplifying
a2 = 225

Take the square root of each side:
a = {-15, 15}