12x^2+9x^2-60=0

Solution for 12x^2+9x^2-60=0 equation:

Simplifying
12x2 + 9x2 + -60 = 0

Reorder the terms:
-60 + 12x2 + 9x2 = 0

Combine like terms: 12x2 + 9x2 = 21x2
-60 + 21x2 = 0

Solving
-60 + 21x2 = 0

Solving for variable 'x'.

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

Add '60' to each side of the equation.
-60 + 60 + 21x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 21x2 = 0 + 60
21x2 = 0 + 60

Combine like terms: 0 + 60 = 60
21x2 = 60

Divide each side by '21'.
x2 = 2.857142857

Simplifying
x2 = 2.857142857

Take the square root of each side:
x = {-1.690308509, 1.690308509}