384-400x=-56x^2-x

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Solution for 384-400x=-56x^2-x equation:


Simplifying
384 + -400x = -56x2 + -1x

Reorder the terms:
384 + -400x = -1x + -56x2

Solving
384 + -400x = -1x + -56x2

Solving for variable 'x'.

Combine like terms: -400x + x = -399x
384 + -399x + 56x2 = -1x + -56x2 + x + 56x2

Reorder the terms:
384 + -399x + 56x2 = -1x + x + -56x2 + 56x2

Combine like terms: -1x + x = 0
384 + -399x + 56x2 = 0 + -56x2 + 56x2
384 + -399x + 56x2 = -56x2 + 56x2

Combine like terms: -56x2 + 56x2 = 0
384 + -399x + 56x2 = 0

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

Divide each side by '56'.
6.857142857 + -7.125x + x2 = 0

Move the constant term to the right:

Add '-6.857142857' to each side of the equation.
6.857142857 + -7.125x + -6.857142857 + x2 = 0 + -6.857142857

Reorder the terms:
6.857142857 + -6.857142857 + -7.125x + x2 = 0 + -6.857142857

Combine like terms: 6.857142857 + -6.857142857 = 0.000000000
0.000000000 + -7.125x + x2 = 0 + -6.857142857
-7.125x + x2 = 0 + -6.857142857

Combine like terms: 0 + -6.857142857 = -6.857142857
-7.125x + x2 = -6.857142857

The x term is -7.125x.  Take half its coefficient (-3.5625).
Square it (12.69140625) and add it to both sides.

Add '12.69140625' to each side of the equation.
-7.125x + 12.69140625 + x2 = -6.857142857 + 12.69140625

Reorder the terms:
12.69140625 + -7.125x + x2 = -6.857142857 + 12.69140625

Combine like terms: -6.857142857 + 12.69140625 = 5.834263393
12.69140625 + -7.125x + x2 = 5.834263393

Factor a perfect square on the left side:
(x + -3.5625)(x + -3.5625) = 5.834263393

Calculate the square root of the right side: 2.415421991

Break this problem into two subproblems by setting 
(x + -3.5625) equal to 2.415421991 and -2.415421991.

Subproblem 1

x + -3.5625 = 2.415421991 Simplifying x + -3.5625 = 2.415421991 Reorder the terms: -3.5625 + x = 2.415421991 Solving -3.5625 + x = 2.415421991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5625' to each side of the equation. -3.5625 + 3.5625 + x = 2.415421991 + 3.5625 Combine like terms: -3.5625 + 3.5625 = 0.0000 0.0000 + x = 2.415421991 + 3.5625 x = 2.415421991 + 3.5625 Combine like terms: 2.415421991 + 3.5625 = 5.977921991 x = 5.977921991 Simplifying x = 5.977921991

Subproblem 2

x + -3.5625 = -2.415421991 Simplifying x + -3.5625 = -2.415421991 Reorder the terms: -3.5625 + x = -2.415421991 Solving -3.5625 + x = -2.415421991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5625' to each side of the equation. -3.5625 + 3.5625 + x = -2.415421991 + 3.5625 Combine like terms: -3.5625 + 3.5625 = 0.0000 0.0000 + x = -2.415421991 + 3.5625 x = -2.415421991 + 3.5625 Combine like terms: -2.415421991 + 3.5625 = 1.147078009 x = 1.147078009 Simplifying x = 1.147078009

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.977921991, 1.147078009}

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