3.1x^2-14x+5=0

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Solution for 3.1x^2-14x+5=0 equation:


Simplifying
3.1x2 + -14x + 5 = 0

Reorder the terms:
5 + -14x + 3.1x2 = 0

Solving
5 + -14x + 3.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.1'.
1.612903226 + -4.516129032x + x2 = 0

Move the constant term to the right:

Add '-1.612903226' to each side of the equation.
1.612903226 + -4.516129032x + -1.612903226 + x2 = 0 + -1.612903226

Reorder the terms:
1.612903226 + -1.612903226 + -4.516129032x + x2 = 0 + -1.612903226

Combine like terms: 1.612903226 + -1.612903226 = 0.000000000
0.000000000 + -4.516129032x + x2 = 0 + -1.612903226
-4.516129032x + x2 = 0 + -1.612903226

Combine like terms: 0 + -1.612903226 = -1.612903226
-4.516129032x + x2 = -1.612903226

The x term is -4.516129032x.  Take half its coefficient (-2.258064516).
Square it (5.098855358) and add it to both sides.

Add '5.098855358' to each side of the equation.
-4.516129032x + 5.098855358 + x2 = -1.612903226 + 5.098855358

Reorder the terms:
5.098855358 + -4.516129032x + x2 = -1.612903226 + 5.098855358

Combine like terms: -1.612903226 + 5.098855358 = 3.485952132
5.098855358 + -4.516129032x + x2 = 3.485952132

Factor a perfect square on the left side:
(x + -2.258064516)(x + -2.258064516) = 3.485952132

Calculate the square root of the right side: 1.867070468

Break this problem into two subproblems by setting 
(x + -2.258064516) equal to 1.867070468 and -1.867070468.

Subproblem 1

x + -2.258064516 = 1.867070468 Simplifying x + -2.258064516 = 1.867070468 Reorder the terms: -2.258064516 + x = 1.867070468 Solving -2.258064516 + x = 1.867070468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.258064516' to each side of the equation. -2.258064516 + 2.258064516 + x = 1.867070468 + 2.258064516 Combine like terms: -2.258064516 + 2.258064516 = 0.000000000 0.000000000 + x = 1.867070468 + 2.258064516 x = 1.867070468 + 2.258064516 Combine like terms: 1.867070468 + 2.258064516 = 4.125134984 x = 4.125134984 Simplifying x = 4.125134984

Subproblem 2

x + -2.258064516 = -1.867070468 Simplifying x + -2.258064516 = -1.867070468 Reorder the terms: -2.258064516 + x = -1.867070468 Solving -2.258064516 + x = -1.867070468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.258064516' to each side of the equation. -2.258064516 + 2.258064516 + x = -1.867070468 + 2.258064516 Combine like terms: -2.258064516 + 2.258064516 = 0.000000000 0.000000000 + x = -1.867070468 + 2.258064516 x = -1.867070468 + 2.258064516 Combine like terms: -1.867070468 + 2.258064516 = 0.390994048 x = 0.390994048 Simplifying x = 0.390994048

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.125134984, 0.390994048}

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