14x^2+47x+7=0

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Solution for 14x^2+47x+7=0 equation:


Simplifying
14x2 + 47x + 7 = 0

Reorder the terms:
7 + 47x + 14x2 = 0

Solving
7 + 47x + 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'.
0.5 + 3.357142857x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 3.357142857x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 3.357142857x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 3.357142857x + x2 = 0 + -0.5
3.357142857x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
3.357142857x + x2 = -0.5

The x term is 3.357142857x.  Take half its coefficient (1.678571429).
Square it (2.817602042) and add it to both sides.

Add '2.817602042' to each side of the equation.
3.357142857x + 2.817602042 + x2 = -0.5 + 2.817602042

Reorder the terms:
2.817602042 + 3.357142857x + x2 = -0.5 + 2.817602042

Combine like terms: -0.5 + 2.817602042 = 2.317602042
2.817602042 + 3.357142857x + x2 = 2.317602042

Factor a perfect square on the left side:
(x + 1.678571429)(x + 1.678571429) = 2.317602042

Calculate the square root of the right side: 1.522367249

Break this problem into two subproblems by setting 
(x + 1.678571429) equal to 1.522367249 and -1.522367249.

Subproblem 1

x + 1.678571429 = 1.522367249 Simplifying x + 1.678571429 = 1.522367249 Reorder the terms: 1.678571429 + x = 1.522367249 Solving 1.678571429 + x = 1.522367249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.678571429' to each side of the equation. 1.678571429 + -1.678571429 + x = 1.522367249 + -1.678571429 Combine like terms: 1.678571429 + -1.678571429 = 0.000000000 0.000000000 + x = 1.522367249 + -1.678571429 x = 1.522367249 + -1.678571429 Combine like terms: 1.522367249 + -1.678571429 = -0.15620418 x = -0.15620418 Simplifying x = -0.15620418

Subproblem 2

x + 1.678571429 = -1.522367249 Simplifying x + 1.678571429 = -1.522367249 Reorder the terms: 1.678571429 + x = -1.522367249 Solving 1.678571429 + x = -1.522367249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.678571429' to each side of the equation. 1.678571429 + -1.678571429 + x = -1.522367249 + -1.678571429 Combine like terms: 1.678571429 + -1.678571429 = 0.000000000 0.000000000 + x = -1.522367249 + -1.678571429 x = -1.522367249 + -1.678571429 Combine like terms: -1.522367249 + -1.678571429 = -3.200938678 x = -3.200938678 Simplifying x = -3.200938678

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.15620418, -3.200938678}

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