40x^2+80x-60=0

Solution for 40x^2+80x-60=0 equation:

Simplifying
40x2 + 80x + -60 = 0

Reorder the terms:
-60 + 80x + 40x2 = 0

Solving
-60 + 80x + 40x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '20'.
20(-3 + 4x + 2x2) = 0

Ignore the factor 20.
Subproblem 1
Set the factor '(-3 + 4x + 2x2)' equal to zero and attempt to solve:

Simplifying
-3 + 4x + 2x2 = 0

Solving
-3 + 4x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-1.5 + 2x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 2x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 2x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 2x + x2 = 0 + 1.5
2x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
2x + x2 = 1.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1.5 + 1

Reorder the terms:
1 + 2x + x2 = 1.5 + 1

Combine like terms: 1.5 + 1 = 2.5
1 + 2x + x2 = 2.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 2.5

Calculate the square root of the right side: 1.58113883

Break this problem into two subproblems by setting 
(x + 1) equal to 1.58113883 and -1.58113883.

Subproblem 1
x + 1 = 1.58113883

Simplifying
x + 1 = 1.58113883

Reorder the terms:
1 + x = 1.58113883

Solving
1 + x = 1.58113883

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = 1.58113883 + -1

Combine like terms: 1 + -1 = 0
0 + x = 1.58113883 + -1
x = 1.58113883 + -1

Combine like terms: 1.58113883 + -1 = 0.58113883
x = 0.58113883

Simplifying
x = 0.58113883

Subproblem 2
x + 1 = -1.58113883

Simplifying
x + 1 = -1.58113883

Reorder the terms:
1 + x = -1.58113883

Solving
1 + x = -1.58113883

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = -1.58113883 + -1

Combine like terms: 1 + -1 = 0
0 + x = -1.58113883 + -1
x = -1.58113883 + -1

Combine like terms: -1.58113883 + -1 = -2.58113883
x = -2.58113883

Simplifying
x = -2.58113883

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.58113883, -2.58113883}
Solution
x = {0.58113883, -2.58113883}