90x^2-120+40=0

Solution for 90x^2-120+40=0 equation:

Simplifying
90x2 + -120 + 40 = 0

Reorder the terms:
-120 + 40 + 90x2 = 0

Combine like terms: -120 + 40 = -80
-80 + 90x2 = 0

Solving
-80 + 90x2 = 0

Solving for variable 'x'.

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

Add '80' to each side of the equation.
-80 + 80 + 90x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 90x2 = 0 + 80
90x2 = 0 + 80

Combine like terms: 0 + 80 = 80
90x2 = 80

Divide each side by '90'.
x2 = 0.8888888889

Simplifying
x2 = 0.8888888889

Take the square root of each side:
x = {-0.942809042, 0.942809042}