4a^2-20=0

Solution for 4a^2-20=0 equation:

Simplifying
4a2 + -20 = 0

Reorder the terms:
-20 + 4a2 = 0

Solving
-20 + 4a2 = 0

Solving for variable 'a'.

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

Add '20' to each side of the equation.
-20 + 20 + 4a2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 4a2 = 0 + 20
4a2 = 0 + 20

Combine like terms: 0 + 20 = 20
4a2 = 20

Divide each side by '4'.
a2 = 5

Simplifying
a2 = 5

Take the square root of each side:
a = {-2.236067978, 2.236067978}