140x^2-36x-15=0

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Solution for 140x^2-36x-15=0 equation:


Simplifying
140x2 + -36x + -15 = 0

Reorder the terms:
-15 + -36x + 140x2 = 0

Solving
-15 + -36x + 140x2 = 0

Solving for variable 'x'.

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

Divide each side by '140'.
-0.1071428571 + -0.2571428571x + x2 = 0

Move the constant term to the right:

Add '0.1071428571' to each side of the equation.
-0.1071428571 + -0.2571428571x + 0.1071428571 + x2 = 0 + 0.1071428571

Reorder the terms:
-0.1071428571 + 0.1071428571 + -0.2571428571x + x2 = 0 + 0.1071428571

Combine like terms: -0.1071428571 + 0.1071428571 = 0.0000000000
0.0000000000 + -0.2571428571x + x2 = 0 + 0.1071428571
-0.2571428571x + x2 = 0 + 0.1071428571

Combine like terms: 0 + 0.1071428571 = 0.1071428571
-0.2571428571x + x2 = 0.1071428571

The x term is -0.2571428571x.  Take half its coefficient (-0.1285714286).
Square it (0.01653061225) and add it to both sides.

Add '0.01653061225' to each side of the equation.
-0.2571428571x + 0.01653061225 + x2 = 0.1071428571 + 0.01653061225

Reorder the terms:
0.01653061225 + -0.2571428571x + x2 = 0.1071428571 + 0.01653061225

Combine like terms: 0.1071428571 + 0.01653061225 = 0.12367346935
0.01653061225 + -0.2571428571x + x2 = 0.12367346935

Factor a perfect square on the left side:
(x + -0.1285714286)(x + -0.1285714286) = 0.12367346935

Calculate the square root of the right side: 0.351672389

Break this problem into two subproblems by setting 
(x + -0.1285714286) equal to 0.351672389 and -0.351672389.

Subproblem 1

x + -0.1285714286 = 0.351672389 Simplifying x + -0.1285714286 = 0.351672389 Reorder the terms: -0.1285714286 + x = 0.351672389 Solving -0.1285714286 + x = 0.351672389 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1285714286' to each side of the equation. -0.1285714286 + 0.1285714286 + x = 0.351672389 + 0.1285714286 Combine like terms: -0.1285714286 + 0.1285714286 = 0.0000000000 0.0000000000 + x = 0.351672389 + 0.1285714286 x = 0.351672389 + 0.1285714286 Combine like terms: 0.351672389 + 0.1285714286 = 0.4802438176 x = 0.4802438176 Simplifying x = 0.4802438176

Subproblem 2

x + -0.1285714286 = -0.351672389 Simplifying x + -0.1285714286 = -0.351672389 Reorder the terms: -0.1285714286 + x = -0.351672389 Solving -0.1285714286 + x = -0.351672389 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1285714286' to each side of the equation. -0.1285714286 + 0.1285714286 + x = -0.351672389 + 0.1285714286 Combine like terms: -0.1285714286 + 0.1285714286 = 0.0000000000 0.0000000000 + x = -0.351672389 + 0.1285714286 x = -0.351672389 + 0.1285714286 Combine like terms: -0.351672389 + 0.1285714286 = -0.2231009604 x = -0.2231009604 Simplifying x = -0.2231009604

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4802438176, -0.2231009604}

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