20=a^2

Solution for 20=a^2 equation:

Simplifying
20 = a2

Solving
20 = 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.
20 + -1a2 = a2 + -1a2

Combine like terms: a2 + -1a2 = 0
20 + -1a2 = 0

Add '-20' to each side of the equation.
20 + -20 + -1a2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -1a2 = 0 + -20
-1a2 = 0 + -20

Combine like terms: 0 + -20 = -20
-1a2 = -20

Divide each side by '-1'.
a2 = 20

Simplifying
a2 = 20

Take the square root of each side:
a = {-4.472135955, 4.472135955}