5x^2+6x-31=0

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Solution for 5x^2+6x-31=0 equation:


Simplifying
5x2 + 6x + -31 = 0

Reorder the terms:
-31 + 6x + 5x2 = 0

Solving
-31 + 6x + 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'.
-6.2 + 1.2x + x2 = 0

Move the constant term to the right:

Add '6.2' to each side of the equation.
-6.2 + 1.2x + 6.2 + x2 = 0 + 6.2

Reorder the terms:
-6.2 + 6.2 + 1.2x + x2 = 0 + 6.2

Combine like terms: -6.2 + 6.2 = 0.0
0.0 + 1.2x + x2 = 0 + 6.2
1.2x + x2 = 0 + 6.2

Combine like terms: 0 + 6.2 = 6.2
1.2x + x2 = 6.2

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = 6.2 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = 6.2 + 0.36

Combine like terms: 6.2 + 0.36 = 6.56
0.36 + 1.2x + x2 = 6.56

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 6.56

Calculate the square root of the right side: 2.561249695

Break this problem into two subproblems by setting 
(x + 0.6) equal to 2.561249695 and -2.561249695.

Subproblem 1

x + 0.6 = 2.561249695 Simplifying x + 0.6 = 2.561249695 Reorder the terms: 0.6 + x = 2.561249695 Solving 0.6 + x = 2.561249695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 2.561249695 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 2.561249695 + -0.6 x = 2.561249695 + -0.6 Combine like terms: 2.561249695 + -0.6 = 1.961249695 x = 1.961249695 Simplifying x = 1.961249695

Subproblem 2

x + 0.6 = -2.561249695 Simplifying x + 0.6 = -2.561249695 Reorder the terms: 0.6 + x = -2.561249695 Solving 0.6 + x = -2.561249695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -2.561249695 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -2.561249695 + -0.6 x = -2.561249695 + -0.6 Combine like terms: -2.561249695 + -0.6 = -3.161249695 x = -3.161249695 Simplifying x = -3.161249695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.961249695, -3.161249695}

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