a^2-8-20=0

Solution for a^2-8-20=0 equation:

Simplifying
a2 + -8 + -20 = 0

Reorder the terms:
-8 + -20 + a2 = 0

Combine like terms: -8 + -20 = -28
-28 + a2 = 0

Solving
-28 + a2 = 0

Solving for variable 'a'.

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

Add '28' to each side of the equation.
-28 + 28 + a2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + a2 = 0 + 28
a2 = 0 + 28

Combine like terms: 0 + 28 = 28
a2 = 28

Simplifying
a2 = 28

Take the square root of each side:
a = {-5.291502622, 5.291502622}