-1.3x^2=13x-8

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Solution for -1.3x^2=13x-8 equation:


Simplifying
-1.3x2 = 13x + -8

Reorder the terms:
-1.3x2 = -8 + 13x

Solving
-1.3x2 = -8 + 13x

Solving for variable 'x'.

Reorder the terms:
8 + -13x + -1.3x2 = -8 + 13x + 8 + -13x

Reorder the terms:
8 + -13x + -1.3x2 = -8 + 8 + 13x + -13x

Combine like terms: -8 + 8 = 0
8 + -13x + -1.3x2 = 0 + 13x + -13x
8 + -13x + -1.3x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
8 + -13x + -1.3x2 = 0

Begin completing the square.  Divide all terms by
-1.3 the coefficient of the squared term: 

Divide each side by '-1.3'.
-6.153846154 + 10x + x2 = 0

Move the constant term to the right:

Add '6.153846154' to each side of the equation.
-6.153846154 + 10x + 6.153846154 + x2 = 0 + 6.153846154

Reorder the terms:
-6.153846154 + 6.153846154 + 10x + x2 = 0 + 6.153846154

Combine like terms: -6.153846154 + 6.153846154 = 0.000000000
0.000000000 + 10x + x2 = 0 + 6.153846154
10x + x2 = 0 + 6.153846154

Combine like terms: 0 + 6.153846154 = 6.153846154
10x + x2 = 6.153846154

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 6.153846154 + 25

Reorder the terms:
25 + 10x + x2 = 6.153846154 + 25

Combine like terms: 6.153846154 + 25 = 31.153846154
25 + 10x + x2 = 31.153846154

Factor a perfect square on the left side:
(x + 5)(x + 5) = 31.153846154

Calculate the square root of the right side: 5.581563057

Break this problem into two subproblems by setting 
(x + 5) equal to 5.581563057 and -5.581563057.

Subproblem 1

x + 5 = 5.581563057 Simplifying x + 5 = 5.581563057 Reorder the terms: 5 + x = 5.581563057 Solving 5 + x = 5.581563057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 5.581563057 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.581563057 + -5 x = 5.581563057 + -5 Combine like terms: 5.581563057 + -5 = 0.581563057 x = 0.581563057 Simplifying x = 0.581563057

Subproblem 2

x + 5 = -5.581563057 Simplifying x + 5 = -5.581563057 Reorder the terms: 5 + x = -5.581563057 Solving 5 + x = -5.581563057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -5.581563057 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.581563057 + -5 x = -5.581563057 + -5 Combine like terms: -5.581563057 + -5 = -10.581563057 x = -10.581563057 Simplifying x = -10.581563057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.581563057, -10.581563057}

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