-8x^2+2x+13=0

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Solution for -8x^2+2x+13=0 equation:


Simplifying
-8x2 + 2x + 13 = 0

Reorder the terms:
13 + 2x + -8x2 = 0

Solving
13 + 2x + -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'.
-1.625 + -0.25x + x2 = 0

Move the constant term to the right:

Add '1.625' to each side of the equation.
-1.625 + -0.25x + 1.625 + x2 = 0 + 1.625

Reorder the terms:
-1.625 + 1.625 + -0.25x + x2 = 0 + 1.625

Combine like terms: -1.625 + 1.625 = 0.000
0.000 + -0.25x + x2 = 0 + 1.625
-0.25x + x2 = 0 + 1.625

Combine like terms: 0 + 1.625 = 1.625
-0.25x + x2 = 1.625

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 1.625 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 1.625 + 0.015625

Combine like terms: 1.625 + 0.015625 = 1.640625
0.015625 + -0.25x + x2 = 1.640625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 1.640625

Calculate the square root of the right side: 1.280868846

Break this problem into two subproblems by setting 
(x + -0.125) equal to 1.280868846 and -1.280868846.

Subproblem 1

x + -0.125 = 1.280868846 Simplifying x + -0.125 = 1.280868846 Reorder the terms: -0.125 + x = 1.280868846 Solving -0.125 + x = 1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 1.280868846 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 1.280868846 + 0.125 x = 1.280868846 + 0.125 Combine like terms: 1.280868846 + 0.125 = 1.405868846 x = 1.405868846 Simplifying x = 1.405868846

Subproblem 2

x + -0.125 = -1.280868846 Simplifying x + -0.125 = -1.280868846 Reorder the terms: -0.125 + x = -1.280868846 Solving -0.125 + x = -1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -1.280868846 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -1.280868846 + 0.125 x = -1.280868846 + 0.125 Combine like terms: -1.280868846 + 0.125 = -1.155868846 x = -1.155868846 Simplifying x = -1.155868846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.405868846, -1.155868846}

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