0=59-0.3x^2-2x+12

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Solution for 0=59-0.3x^2-2x+12 equation:


Simplifying
0 = 59 + -0.3x2 + -2x + 12

Reorder the terms:
0 = 59 + 12 + -2x + -0.3x2

Combine like terms: 59 + 12 = 71
0 = 71 + -2x + -0.3x2

Solving
0 = 71 + -2x + -0.3x2

Solving for variable 'x'.

Combine like terms: 0 + -71 = -71
-71 + 2x + 0.3x2 = 71 + -2x + -0.3x2 + -71 + 2x + 0.3x2

Reorder the terms:
-71 + 2x + 0.3x2 = 71 + -71 + -2x + 2x + -0.3x2 + 0.3x2

Combine like terms: 71 + -71 = 0
-71 + 2x + 0.3x2 = 0 + -2x + 2x + -0.3x2 + 0.3x2
-71 + 2x + 0.3x2 = -2x + 2x + -0.3x2 + 0.3x2

Combine like terms: -2x + 2x = 0
-71 + 2x + 0.3x2 = 0 + -0.3x2 + 0.3x2
-71 + 2x + 0.3x2 = -0.3x2 + 0.3x2

Combine like terms: -0.3x2 + 0.3x2 = 0.0
-71 + 2x + 0.3x2 = 0.0

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

Divide each side by '0.3'.
-236.6666667 + 6.666666667x + x2 = 0

Move the constant term to the right:

Add '236.6666667' to each side of the equation.
-236.6666667 + 6.666666667x + 236.6666667 + x2 = 0 + 236.6666667

Reorder the terms:
-236.6666667 + 236.6666667 + 6.666666667x + x2 = 0 + 236.6666667

Combine like terms: -236.6666667 + 236.6666667 = 0.0000000
0.0000000 + 6.666666667x + x2 = 0 + 236.6666667
6.666666667x + x2 = 0 + 236.6666667

Combine like terms: 0 + 236.6666667 = 236.6666667
6.666666667x + x2 = 236.6666667

The x term is 6.666666667x.  Take half its coefficient (3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
6.666666667x + 11.11111112 + x2 = 236.6666667 + 11.11111112

Reorder the terms:
11.11111112 + 6.666666667x + x2 = 236.6666667 + 11.11111112

Combine like terms: 236.6666667 + 11.11111112 = 247.77777782
11.11111112 + 6.666666667x + x2 = 247.77777782

Factor a perfect square on the left side:
(x + 3.333333334)(x + 3.333333334) = 247.77777782

Calculate the square root of the right side: 15.740958605

Break this problem into two subproblems by setting 
(x + 3.333333334) equal to 15.740958605 and -15.740958605.

Subproblem 1

x + 3.333333334 = 15.740958605 Simplifying x + 3.333333334 = 15.740958605 Reorder the terms: 3.333333334 + x = 15.740958605 Solving 3.333333334 + x = 15.740958605 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = 15.740958605 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = 15.740958605 + -3.333333334 x = 15.740958605 + -3.333333334 Combine like terms: 15.740958605 + -3.333333334 = 12.407625271 x = 12.407625271 Simplifying x = 12.407625271

Subproblem 2

x + 3.333333334 = -15.740958605 Simplifying x + 3.333333334 = -15.740958605 Reorder the terms: 3.333333334 + x = -15.740958605 Solving 3.333333334 + x = -15.740958605 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = -15.740958605 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = -15.740958605 + -3.333333334 x = -15.740958605 + -3.333333334 Combine like terms: -15.740958605 + -3.333333334 = -19.074291939 x = -19.074291939 Simplifying x = -19.074291939

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.407625271, -19.074291939}

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