-0.33x^2-5.94x=26.4

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Solution for -0.33x^2-5.94x=26.4 equation:


Simplifying
-0.33x2 + -5.94x = 26.4

Reorder the terms:
-5.94x + -0.33x2 = 26.4

Solving
-5.94x + -0.33x2 = 26.4

Solving for variable 'x'.

Reorder the terms:
-26.4 + -5.94x + -0.33x2 = 26.4 + -26.4

Combine like terms: 26.4 + -26.4 = 0.0
-26.4 + -5.94x + -0.33x2 = 0.0

Begin completing the square.  Divide all terms by
-0.33 the coefficient of the squared term: 

Divide each side by '-0.33'.
80 + 18x + x2 = 0

Move the constant term to the right:

Add '-80' to each side of the equation.
80 + 18x + -80 + x2 = 0 + -80

Reorder the terms:
80 + -80 + 18x + x2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + 18x + x2 = 0 + -80
18x + x2 = 0 + -80

Combine like terms: 0 + -80 = -80
18x + x2 = -80

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = -80 + 81

Reorder the terms:
81 + 18x + x2 = -80 + 81

Combine like terms: -80 + 81 = 1
81 + 18x + x2 = 1

Factor a perfect square on the left side:
(x + 9)(x + 9) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + 9) equal to 1 and -1.

Subproblem 1

x + 9 = 1 Simplifying x + 9 = 1 Reorder the terms: 9 + x = 1 Solving 9 + x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 1 + -9 Combine like terms: 9 + -9 = 0 0 + x = 1 + -9 x = 1 + -9 Combine like terms: 1 + -9 = -8 x = -8 Simplifying x = -8

Subproblem 2

x + 9 = -1 Simplifying x + 9 = -1 Reorder the terms: 9 + x = -1 Solving 9 + x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -1 + -9 Combine like terms: 9 + -9 = 0 0 + x = -1 + -9 x = -1 + -9 Combine like terms: -1 + -9 = -10 x = -10 Simplifying x = -10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-8, -10}

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