.15x^2-.32x-3.6=0

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Solution for .15x^2-.32x-3.6=0 equation:


Simplifying
0.15x2 + -0.32x + -3.6 = 0

Reorder the terms:
-3.6 + -0.32x + 0.15x2 = 0

Solving
-3.6 + -0.32x + 0.15x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.15'.
-24 + -2.133333333x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -2.133333333x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -2.133333333x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -2.133333333x + x2 = 0 + 24
-2.133333333x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-2.133333333x + x2 = 24

The x term is -2.133333333x.  Take half its coefficient (-1.066666667).
Square it (1.137777778) and add it to both sides.

Add '1.137777778' to each side of the equation.
-2.133333333x + 1.137777778 + x2 = 24 + 1.137777778

Reorder the terms:
1.137777778 + -2.133333333x + x2 = 24 + 1.137777778

Combine like terms: 24 + 1.137777778 = 25.137777778
1.137777778 + -2.133333333x + x2 = 25.137777778

Factor a perfect square on the left side:
(x + -1.066666667)(x + -1.066666667) = 25.137777778

Calculate the square root of the right side: 5.013758847

Break this problem into two subproblems by setting 
(x + -1.066666667) equal to 5.013758847 and -5.013758847.

Subproblem 1

x + -1.066666667 = 5.013758847 Simplifying x + -1.066666667 = 5.013758847 Reorder the terms: -1.066666667 + x = 5.013758847 Solving -1.066666667 + x = 5.013758847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.066666667' to each side of the equation. -1.066666667 + 1.066666667 + x = 5.013758847 + 1.066666667 Combine like terms: -1.066666667 + 1.066666667 = 0.000000000 0.000000000 + x = 5.013758847 + 1.066666667 x = 5.013758847 + 1.066666667 Combine like terms: 5.013758847 + 1.066666667 = 6.080425514 x = 6.080425514 Simplifying x = 6.080425514

Subproblem 2

x + -1.066666667 = -5.013758847 Simplifying x + -1.066666667 = -5.013758847 Reorder the terms: -1.066666667 + x = -5.013758847 Solving -1.066666667 + x = -5.013758847 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.066666667' to each side of the equation. -1.066666667 + 1.066666667 + x = -5.013758847 + 1.066666667 Combine like terms: -1.066666667 + 1.066666667 = 0.000000000 0.000000000 + x = -5.013758847 + 1.066666667 x = -5.013758847 + 1.066666667 Combine like terms: -5.013758847 + 1.066666667 = -3.94709218 x = -3.94709218 Simplifying x = -3.94709218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.080425514, -3.94709218}

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