0.291666666667x^2-4x-9=3

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Solution for 0.291666666667x^2-4x-9=3 equation:


Simplifying
0.291666666667x2 + -4x + -9 = 3

Reorder the terms:
-9 + -4x + 0.291666666667x2 = 3

Solving
-9 + -4x + 0.291666666667x2 = 3

Solving for variable 'x'.

Reorder the terms:
-9 + -3 + -4x + 0.291666666667x2 = 3 + -3

Combine like terms: -9 + -3 = -12
-12 + -4x + 0.291666666667x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-12 + -4x + 0.291666666667x2 = 0

Begin completing the square.  Divide all terms by
0.291666666667 the coefficient of the squared term: 

Divide each side by '0.291666666667'.
-41.14285714 + -13.71428571x + x2 = 0

Move the constant term to the right:

Add '41.14285714' to each side of the equation.
-41.14285714 + -13.71428571x + 41.14285714 + x2 = 0 + 41.14285714

Reorder the terms:
-41.14285714 + 41.14285714 + -13.71428571x + x2 = 0 + 41.14285714

Combine like terms: -41.14285714 + 41.14285714 = 0.00000000
0.00000000 + -13.71428571x + x2 = 0 + 41.14285714
-13.71428571x + x2 = 0 + 41.14285714

Combine like terms: 0 + 41.14285714 = 41.14285714
-13.71428571x + x2 = 41.14285714

The x term is -13.71428571x.  Take half its coefficient (-6.857142855).
Square it (47.02040813) and add it to both sides.

Add '47.02040813' to each side of the equation.
-13.71428571x + 47.02040813 + x2 = 41.14285714 + 47.02040813

Reorder the terms:
47.02040813 + -13.71428571x + x2 = 41.14285714 + 47.02040813

Combine like terms: 41.14285714 + 47.02040813 = 88.16326527
47.02040813 + -13.71428571x + x2 = 88.16326527

Factor a perfect square on the left side:
(x + -6.857142855)(x + -6.857142855) = 88.16326527

Calculate the square root of the right side: 9.389529555

Break this problem into two subproblems by setting 
(x + -6.857142855) equal to 9.389529555 and -9.389529555.

Subproblem 1

x + -6.857142855 = 9.389529555 Simplifying x + -6.857142855 = 9.389529555 Reorder the terms: -6.857142855 + x = 9.389529555 Solving -6.857142855 + x = 9.389529555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.857142855' to each side of the equation. -6.857142855 + 6.857142855 + x = 9.389529555 + 6.857142855 Combine like terms: -6.857142855 + 6.857142855 = 0.000000000 0.000000000 + x = 9.389529555 + 6.857142855 x = 9.389529555 + 6.857142855 Combine like terms: 9.389529555 + 6.857142855 = 16.24667241 x = 16.24667241 Simplifying x = 16.24667241

Subproblem 2

x + -6.857142855 = -9.389529555 Simplifying x + -6.857142855 = -9.389529555 Reorder the terms: -6.857142855 + x = -9.389529555 Solving -6.857142855 + x = -9.389529555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.857142855' to each side of the equation. -6.857142855 + 6.857142855 + x = -9.389529555 + 6.857142855 Combine like terms: -6.857142855 + 6.857142855 = 0.000000000 0.000000000 + x = -9.389529555 + 6.857142855 x = -9.389529555 + 6.857142855 Combine like terms: -9.389529555 + 6.857142855 = -2.5323867 x = -2.5323867 Simplifying x = -2.5323867

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.24667241, -2.5323867}

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