5x^2+14.1x-5=0

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Solution for 5x^2+14.1x-5=0 equation:


Simplifying
5x2 + 14.1x + -5 = 0

Reorder the terms:
-5 + 14.1x + 5x2 = 0

Solving
-5 + 14.1x + 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'.
-1 + 2.82x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 2.82x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 2.82x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 2.82x + x2 = 0 + 1
2.82x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
2.82x + x2 = 1

The x term is 2.82x.  Take half its coefficient (1.41).
Square it (1.9881) and add it to both sides.

Add '1.9881' to each side of the equation.
2.82x + 1.9881 + x2 = 1 + 1.9881

Reorder the terms:
1.9881 + 2.82x + x2 = 1 + 1.9881

Combine like terms: 1 + 1.9881 = 2.9881
1.9881 + 2.82x + x2 = 2.9881

Factor a perfect square on the left side:
(x + 1.41)(x + 1.41) = 2.9881

Calculate the square root of the right side: 1.72861216

Break this problem into two subproblems by setting 
(x + 1.41) equal to 1.72861216 and -1.72861216.

Subproblem 1

x + 1.41 = 1.72861216 Simplifying x + 1.41 = 1.72861216 Reorder the terms: 1.41 + x = 1.72861216 Solving 1.41 + x = 1.72861216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.41' to each side of the equation. 1.41 + -1.41 + x = 1.72861216 + -1.41 Combine like terms: 1.41 + -1.41 = 0.00 0.00 + x = 1.72861216 + -1.41 x = 1.72861216 + -1.41 Combine like terms: 1.72861216 + -1.41 = 0.31861216 x = 0.31861216 Simplifying x = 0.31861216

Subproblem 2

x + 1.41 = -1.72861216 Simplifying x + 1.41 = -1.72861216 Reorder the terms: 1.41 + x = -1.72861216 Solving 1.41 + x = -1.72861216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.41' to each side of the equation. 1.41 + -1.41 + x = -1.72861216 + -1.41 Combine like terms: 1.41 + -1.41 = 0.00 0.00 + x = -1.72861216 + -1.41 x = -1.72861216 + -1.41 Combine like terms: -1.72861216 + -1.41 = -3.13861216 x = -3.13861216 Simplifying x = -3.13861216

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.31861216, -3.13861216}

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