0.29x^2-4x=-8

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Solution for 0.29x^2-4x=-8 equation:


Simplifying
0.29x2 + -4x = -8

Reorder the terms:
-4x + 0.29x2 = -8

Solving
-4x + 0.29x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + -4x + 0.29x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + -4x + 0.29x2 = 0

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

Divide each side by '0.29'.
27.5862069 + -13.79310345x + x2 = 0

Move the constant term to the right:

Add '-27.5862069' to each side of the equation.
27.5862069 + -13.79310345x + -27.5862069 + x2 = 0 + -27.5862069

Reorder the terms:
27.5862069 + -27.5862069 + -13.79310345x + x2 = 0 + -27.5862069

Combine like terms: 27.5862069 + -27.5862069 = 0.0000000
0.0000000 + -13.79310345x + x2 = 0 + -27.5862069
-13.79310345x + x2 = 0 + -27.5862069

Combine like terms: 0 + -27.5862069 = -27.5862069
-13.79310345x + x2 = -27.5862069

The x term is -13.79310345x.  Take half its coefficient (-6.896551725).
Square it (47.56242570) and add it to both sides.

Add '47.56242570' to each side of the equation.
-13.79310345x + 47.56242570 + x2 = -27.5862069 + 47.56242570

Reorder the terms:
47.56242570 + -13.79310345x + x2 = -27.5862069 + 47.56242570

Combine like terms: -27.5862069 + 47.56242570 = 19.9762188
47.56242570 + -13.79310345x + x2 = 19.9762188

Factor a perfect square on the left side:
(x + -6.896551725)(x + -6.896551725) = 19.9762188

Calculate the square root of the right side: 4.469476345

Break this problem into two subproblems by setting 
(x + -6.896551725) equal to 4.469476345 and -4.469476345.

Subproblem 1

x + -6.896551725 = 4.469476345 Simplifying x + -6.896551725 = 4.469476345 Reorder the terms: -6.896551725 + x = 4.469476345 Solving -6.896551725 + x = 4.469476345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.896551725' to each side of the equation. -6.896551725 + 6.896551725 + x = 4.469476345 + 6.896551725 Combine like terms: -6.896551725 + 6.896551725 = 0.000000000 0.000000000 + x = 4.469476345 + 6.896551725 x = 4.469476345 + 6.896551725 Combine like terms: 4.469476345 + 6.896551725 = 11.36602807 x = 11.36602807 Simplifying x = 11.36602807

Subproblem 2

x + -6.896551725 = -4.469476345 Simplifying x + -6.896551725 = -4.469476345 Reorder the terms: -6.896551725 + x = -4.469476345 Solving -6.896551725 + x = -4.469476345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.896551725' to each side of the equation. -6.896551725 + 6.896551725 + x = -4.469476345 + 6.896551725 Combine like terms: -6.896551725 + 6.896551725 = 0.000000000 0.000000000 + x = -4.469476345 + 6.896551725 x = -4.469476345 + 6.896551725 Combine like terms: -4.469476345 + 6.896551725 = 2.42707538 x = 2.42707538 Simplifying x = 2.42707538

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.36602807, 2.42707538}

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