12x^2+28-40=0

Solution for 12x^2+28-40=0 equation:

Simplifying
12x2 + 28 + -40 = 0

Reorder the terms:
28 + -40 + 12x2 = 0

Combine like terms: 28 + -40 = -12
-12 + 12x2 = 0

Solving
-12 + 12x2 = 0

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 12x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 12x2 = 0 + 12
12x2 = 0 + 12

Combine like terms: 0 + 12 = 12
12x2 = 12

Divide each side by '12'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}