15x^2+17x-12=0

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Solution for 15x^2+17x-12=0 equation: 


Simplifying
15x2 + 17x + -12 = 0

Reorder the terms:
-12 + 17x + 15x2 = 0

Solving
-12 + 17x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-0.8 + 1.133333333x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 1.133333333x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 1.133333333x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 1.133333333x + x2 = 0 + 0.8
1.133333333x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
1.133333333x + x2 = 0.8

The x term is 1.133333333x.  Take half its coefficient (0.5666666665).
Square it (0.3211111109) and add it to both sides.

Add '0.3211111109' to each side of the equation.
1.133333333x + 0.3211111109 + x2 = 0.8 + 0.3211111109

Reorder the terms:
0.3211111109 + 1.133333333x + x2 = 0.8 + 0.3211111109

Combine like terms: 0.8 + 0.3211111109 = 1.1211111109
0.3211111109 + 1.133333333x + x2 = 1.1211111109

Factor a perfect square on the left side:
(x + 0.5666666665)(x + 0.5666666665) = 1.1211111109

Calculate the square root of the right side: 1.058825345

Break this problem into two subproblems by setting 
(x + 0.5666666665) equal to 1.058825345 and -1.058825345.


Subproblem 1
x + 0.5666666665 = 1.058825345

Simplifying
x + 0.5666666665 = 1.058825345

Reorder the terms:
0.5666666665 + x = 1.058825345

Solving
0.5666666665 + x = 1.058825345

Solving for variable 'x'.

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

Add '-0.5666666665' to each side of the equation.
0.5666666665 + -0.5666666665 + x = 1.058825345 + -0.5666666665

Combine like terms: 0.5666666665 + -0.5666666665 = 0.0000000000
0.0000000000 + x = 1.058825345 + -0.5666666665
x = 1.058825345 + -0.5666666665

Combine like terms: 1.058825345 + -0.5666666665 = 0.4921586785
x = 0.4921586785

Simplifying
x = 0.4921586785


Subproblem 2
x + 0.5666666665 = -1.058825345

Simplifying
x + 0.5666666665 = -1.058825345

Reorder the terms:
0.5666666665 + x = -1.058825345

Solving
0.5666666665 + x = -1.058825345

Solving for variable 'x'.

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

Add '-0.5666666665' to each side of the equation.
0.5666666665 + -0.5666666665 + x = -1.058825345 + -0.5666666665

Combine like terms: 0.5666666665 + -0.5666666665 = 0.0000000000
0.0000000000 + x = -1.058825345 + -0.5666666665
x = -1.058825345 + -0.5666666665

Combine like terms: -1.058825345 + -0.5666666665 = -1.6254920115
x = -1.6254920115

Simplifying
x = -1.6254920115


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.4921586785, -1.6254920115}

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