25*25-15*15=a^2

Solution for 25*25-15*15=a^2 equation:

Simplifying
25 * 25 + -15 * 15 = a2

Multiply 25 * 25
625 + -15 * 15 = a2

Multiply -15 * 15
625 + -225 = a2

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

Solving
400 = a2

Solving for variable 'a'.

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

Add '-1a2' to each side of the equation.
400 + -1a2 = a2 + -1a2

Combine like terms: a2 + -1a2 = 0
400 + -1a2 = 0

Add '-400' to each side of the equation.
400 + -400 + -1a2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -1a2 = 0 + -400
-1a2 = 0 + -400

Combine like terms: 0 + -400 = -400
-1a2 = -400

Divide each side by '-1'.
a2 = 400

Simplifying
a2 = 400

Take the square root of each side:
a = {-20, 20}