5x^2+14x+1=0

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Solution for 5x^2+14x+1=0 equation:


Simplifying
5x2 + 14x + 1 = 0

Reorder the terms:
1 + 14x + 5x2 = 0

Solving
1 + 14x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.2 + 2.8x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 2.8x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 2.8x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 2.8x + x2 = 0 + -0.2
2.8x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
2.8x + x2 = -0.2

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = -0.2 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = -0.2 + 1.96

Combine like terms: -0.2 + 1.96 = 1.76
1.96 + 2.8x + x2 = 1.76

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 1.76

Calculate the square root of the right side: 1.326649916

Break this problem into two subproblems by setting 
(x + 1.4) equal to 1.326649916 and -1.326649916.

Subproblem 1

x + 1.4 = 1.326649916 Simplifying x + 1.4 = 1.326649916 Reorder the terms: 1.4 + x = 1.326649916 Solving 1.4 + x = 1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 1.326649916 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 1.326649916 + -1.4 x = 1.326649916 + -1.4 Combine like terms: 1.326649916 + -1.4 = -0.073350084 x = -0.073350084 Simplifying x = -0.073350084

Subproblem 2

x + 1.4 = -1.326649916 Simplifying x + 1.4 = -1.326649916 Reorder the terms: 1.4 + x = -1.326649916 Solving 1.4 + x = -1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -1.326649916 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -1.326649916 + -1.4 x = -1.326649916 + -1.4 Combine like terms: -1.326649916 + -1.4 = -2.726649916 x = -2.726649916 Simplifying x = -2.726649916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.073350084, -2.726649916}

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