7x=13x^2-8

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Solution for 7x=13x^2-8 equation:


Simplifying
7x = 13x2 + -8

Reorder the terms:
7x = -8 + 13x2

Solving
7x = -8 + 13x2

Solving for variable 'x'.

Reorder the terms:
8 + 7x + -13x2 = -8 + 13x2 + 8 + -13x2

Reorder the terms:
8 + 7x + -13x2 = -8 + 8 + 13x2 + -13x2

Combine like terms: -8 + 8 = 0
8 + 7x + -13x2 = 0 + 13x2 + -13x2
8 + 7x + -13x2 = 13x2 + -13x2

Combine like terms: 13x2 + -13x2 = 0
8 + 7x + -13x2 = 0

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-0.6153846154 + -0.5384615385x + x2 = 0

Move the constant term to the right:

Add '0.6153846154' to each side of the equation.
-0.6153846154 + -0.5384615385x + 0.6153846154 + x2 = 0 + 0.6153846154

Reorder the terms:
-0.6153846154 + 0.6153846154 + -0.5384615385x + x2 = 0 + 0.6153846154

Combine like terms: -0.6153846154 + 0.6153846154 = 0.0000000000
0.0000000000 + -0.5384615385x + x2 = 0 + 0.6153846154
-0.5384615385x + x2 = 0 + 0.6153846154

Combine like terms: 0 + 0.6153846154 = 0.6153846154
-0.5384615385x + x2 = 0.6153846154

The x term is -0.5384615385x.  Take half its coefficient (-0.2692307693).
Square it (0.07248520714) and add it to both sides.

Add '0.07248520714' to each side of the equation.
-0.5384615385x + 0.07248520714 + x2 = 0.6153846154 + 0.07248520714

Reorder the terms:
0.07248520714 + -0.5384615385x + x2 = 0.6153846154 + 0.07248520714

Combine like terms: 0.6153846154 + 0.07248520714 = 0.68786982254
0.07248520714 + -0.5384615385x + x2 = 0.68786982254

Factor a perfect square on the left side:
(x + -0.2692307693)(x + -0.2692307693) = 0.68786982254

Calculate the square root of the right side: 0.829379179

Break this problem into two subproblems by setting 
(x + -0.2692307693) equal to 0.829379179 and -0.829379179.

Subproblem 1

x + -0.2692307693 = 0.829379179 Simplifying x + -0.2692307693 = 0.829379179 Reorder the terms: -0.2692307693 + x = 0.829379179 Solving -0.2692307693 + x = 0.829379179 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2692307693' to each side of the equation. -0.2692307693 + 0.2692307693 + x = 0.829379179 + 0.2692307693 Combine like terms: -0.2692307693 + 0.2692307693 = 0.0000000000 0.0000000000 + x = 0.829379179 + 0.2692307693 x = 0.829379179 + 0.2692307693 Combine like terms: 0.829379179 + 0.2692307693 = 1.0986099483 x = 1.0986099483 Simplifying x = 1.0986099483

Subproblem 2

x + -0.2692307693 = -0.829379179 Simplifying x + -0.2692307693 = -0.829379179 Reorder the terms: -0.2692307693 + x = -0.829379179 Solving -0.2692307693 + x = -0.829379179 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2692307693' to each side of the equation. -0.2692307693 + 0.2692307693 + x = -0.829379179 + 0.2692307693 Combine like terms: -0.2692307693 + 0.2692307693 = 0.0000000000 0.0000000000 + x = -0.829379179 + 0.2692307693 x = -0.829379179 + 0.2692307693 Combine like terms: -0.829379179 + 0.2692307693 = -0.5601484097 x = -0.5601484097 Simplifying x = -0.5601484097

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0986099483, -0.5601484097}

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