5x^2-12-9=0

Solution for 5x^2-12-9=0 equation:

Simplifying
5x2 + -12 + -9 = 0

Reorder the terms:
-12 + -9 + 5x2 = 0

Combine like terms: -12 + -9 = -21
-21 + 5x2 = 0

Solving
-21 + 5x2 = 0

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 5x2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 5x2 = 0 + 21
5x2 = 0 + 21

Combine like terms: 0 + 21 = 21
5x2 = 21

Divide each side by '5'.
x2 = 4.2

Simplifying
x2 = 4.2

Take the square root of each side:
x = {-2.049390153, 2.049390153}