5x^2-15-90=

Solution for 5x^2-15-90= equation:

Simplifying
5x2 + -15 + -90 = 0

Reorder the terms:
-15 + -90 + 5x2 = 0

Combine like terms: -15 + -90 = -105
-105 + 5x2 = 0

Solving
-105 + 5x2 = 0

Solving for variable 'x'.

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

Add '105' to each side of the equation.
-105 + 105 + 5x2 = 0 + 105

Combine like terms: -105 + 105 = 0
0 + 5x2 = 0 + 105
5x2 = 0 + 105

Combine like terms: 0 + 105 = 105
5x2 = 105

Divide each side by '5'.
x2 = 21

Simplifying
x2 = 21

Take the square root of each side:
x = {-4.582575695, 4.582575695}