14x^2+15x-5=0

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Solution for 14x^2+15x-5=0 equation:


Simplifying
14x2 + 15x + -5 = 0

Reorder the terms:
-5 + 15x + 14x2 = 0

Solving
-5 + 15x + 14x2 = 0

Solving for variable 'x'.

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

Divide each side by '14'.
-0.3571428571 + 1.071428571x + x2 = 0

Move the constant term to the right:

Add '0.3571428571' to each side of the equation.
-0.3571428571 + 1.071428571x + 0.3571428571 + x2 = 0 + 0.3571428571

Reorder the terms:
-0.3571428571 + 0.3571428571 + 1.071428571x + x2 = 0 + 0.3571428571

Combine like terms: -0.3571428571 + 0.3571428571 = 0.0000000000
0.0000000000 + 1.071428571x + x2 = 0 + 0.3571428571
1.071428571x + x2 = 0 + 0.3571428571

Combine like terms: 0 + 0.3571428571 = 0.3571428571
1.071428571x + x2 = 0.3571428571

The x term is 1.071428571x.  Take half its coefficient (0.5357142855).
Square it (0.2869897957) and add it to both sides.

Add '0.2869897957' to each side of the equation.
1.071428571x + 0.2869897957 + x2 = 0.3571428571 + 0.2869897957

Reorder the terms:
0.2869897957 + 1.071428571x + x2 = 0.3571428571 + 0.2869897957

Combine like terms: 0.3571428571 + 0.2869897957 = 0.6441326528
0.2869897957 + 1.071428571x + x2 = 0.6441326528

Factor a perfect square on the left side:
(x + 0.5357142855)(x + 0.5357142855) = 0.6441326528

Calculate the square root of the right side: 0.802578752

Break this problem into two subproblems by setting 
(x + 0.5357142855) equal to 0.802578752 and -0.802578752.

Subproblem 1

x + 0.5357142855 = 0.802578752 Simplifying x + 0.5357142855 = 0.802578752 Reorder the terms: 0.5357142855 + x = 0.802578752 Solving 0.5357142855 + x = 0.802578752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5357142855' to each side of the equation. 0.5357142855 + -0.5357142855 + x = 0.802578752 + -0.5357142855 Combine like terms: 0.5357142855 + -0.5357142855 = 0.0000000000 0.0000000000 + x = 0.802578752 + -0.5357142855 x = 0.802578752 + -0.5357142855 Combine like terms: 0.802578752 + -0.5357142855 = 0.2668644665 x = 0.2668644665 Simplifying x = 0.2668644665

Subproblem 2

x + 0.5357142855 = -0.802578752 Simplifying x + 0.5357142855 = -0.802578752 Reorder the terms: 0.5357142855 + x = -0.802578752 Solving 0.5357142855 + x = -0.802578752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5357142855' to each side of the equation. 0.5357142855 + -0.5357142855 + x = -0.802578752 + -0.5357142855 Combine like terms: 0.5357142855 + -0.5357142855 = 0.0000000000 0.0000000000 + x = -0.802578752 + -0.5357142855 x = -0.802578752 + -0.5357142855 Combine like terms: -0.802578752 + -0.5357142855 = -1.3382930375 x = -1.3382930375 Simplifying x = -1.3382930375

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2668644665, -1.3382930375}

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