8x^2+14x-5=0

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Solution for 8x^2+14x-5=0 equation:


Simplifying
8x2 + 14x + -5 = 0

Reorder the terms:
-5 + 14x + 8x2 = 0

Solving
-5 + 14x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-0.625 + 1.75x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 1.75x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 1.75x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 1.75x + x2 = 0 + 0.625
1.75x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
1.75x + x2 = 0.625

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 0.625 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 0.625 + 0.765625

Combine like terms: 0.625 + 0.765625 = 1.390625
0.765625 + 1.75x + x2 = 1.390625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + 0.875) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + 0.875 = 1.179247642 Simplifying x + 0.875 = 1.179247642 Reorder the terms: 0.875 + x = 1.179247642 Solving 0.875 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 1.179247642 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 1.179247642 + -0.875 x = 1.179247642 + -0.875 Combine like terms: 1.179247642 + -0.875 = 0.304247642 x = 0.304247642 Simplifying x = 0.304247642

Subproblem 2

x + 0.875 = -1.179247642 Simplifying x + 0.875 = -1.179247642 Reorder the terms: 0.875 + x = -1.179247642 Solving 0.875 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -1.179247642 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -1.179247642 + -0.875 x = -1.179247642 + -0.875 Combine like terms: -1.179247642 + -0.875 = -2.054247642 x = -2.054247642 Simplifying x = -2.054247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.304247642, -2.054247642}

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