5n^2-21-20=0

Solution for 5n^2-21-20=0 equation:

Simplifying
5n2 + -21 + -20 = 0

Reorder the terms:
-21 + -20 + 5n2 = 0

Combine like terms: -21 + -20 = -41
-41 + 5n2 = 0

Solving
-41 + 5n2 = 0

Solving for variable 'n'.

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

Add '41' to each side of the equation.
-41 + 41 + 5n2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + 5n2 = 0 + 41
5n2 = 0 + 41

Combine like terms: 0 + 41 = 41
5n2 = 41

Divide each side by '5'.
n2 = 8.2

Simplifying
n2 = 8.2

Take the square root of each side:
n = {-2.863564213, 2.863564213}