8-2x^2+13x=0

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


Simplifying
8 + -2x2 + 13x = 0

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

Solving
8 + 13x + -2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-4 + -6.5x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -6.5x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -6.5x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -6.5x + x2 = 0 + 4
-6.5x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-6.5x + x2 = 4

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 4 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 4 + 10.5625

Combine like terms: 4 + 10.5625 = 14.5625
10.5625 + -6.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + -3.25) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + -3.25 = 3.816084381 Simplifying x + -3.25 = 3.816084381 Reorder the terms: -3.25 + x = 3.816084381 Solving -3.25 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 3.816084381 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 3.816084381 + 3.25 x = 3.816084381 + 3.25 Combine like terms: 3.816084381 + 3.25 = 7.066084381 x = 7.066084381 Simplifying x = 7.066084381

Subproblem 2

x + -3.25 = -3.816084381 Simplifying x + -3.25 = -3.816084381 Reorder the terms: -3.25 + x = -3.816084381 Solving -3.25 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -3.816084381 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -3.816084381 + 3.25 x = -3.816084381 + 3.25 Combine like terms: -3.816084381 + 3.25 = -0.566084381 x = -0.566084381 Simplifying x = -0.566084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.066084381, -0.566084381}

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