3x^2=40x+246

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Solution for 3x^2=40x+246 equation:


Simplifying
3x2 = 40x + 246

Reorder the terms:
3x2 = 246 + 40x

Solving
3x2 = 246 + 40x

Solving for variable 'x'.

Reorder the terms:
-246 + -40x + 3x2 = 246 + 40x + -246 + -40x

Reorder the terms:
-246 + -40x + 3x2 = 246 + -246 + 40x + -40x

Combine like terms: 246 + -246 = 0
-246 + -40x + 3x2 = 0 + 40x + -40x
-246 + -40x + 3x2 = 40x + -40x

Combine like terms: 40x + -40x = 0
-246 + -40x + 3x2 = 0

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

Divide each side by '3'.
-82 + -13.33333333x + x2 = 0

Move the constant term to the right:

Add '82' to each side of the equation.
-82 + -13.33333333x + 82 + x2 = 0 + 82

Reorder the terms:
-82 + 82 + -13.33333333x + x2 = 0 + 82

Combine like terms: -82 + 82 = 0
0 + -13.33333333x + x2 = 0 + 82
-13.33333333x + x2 = 0 + 82

Combine like terms: 0 + 82 = 82
-13.33333333x + x2 = 82

The x term is -13.33333333x.  Take half its coefficient (-6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
-13.33333333x + 44.44444442 + x2 = 82 + 44.44444442

Reorder the terms:
44.44444442 + -13.33333333x + x2 = 82 + 44.44444442

Combine like terms: 82 + 44.44444442 = 126.44444442
44.44444442 + -13.33333333x + x2 = 126.44444442

Factor a perfect square on the left side:
(x + -6.666666665)(x + -6.666666665) = 126.44444442

Calculate the square root of the right side: 11.244751861

Break this problem into two subproblems by setting 
(x + -6.666666665) equal to 11.244751861 and -11.244751861.

Subproblem 1

x + -6.666666665 = 11.244751861 Simplifying x + -6.666666665 = 11.244751861 Reorder the terms: -6.666666665 + x = 11.244751861 Solving -6.666666665 + x = 11.244751861 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = 11.244751861 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = 11.244751861 + 6.666666665 x = 11.244751861 + 6.666666665 Combine like terms: 11.244751861 + 6.666666665 = 17.911418526 x = 17.911418526 Simplifying x = 17.911418526

Subproblem 2

x + -6.666666665 = -11.244751861 Simplifying x + -6.666666665 = -11.244751861 Reorder the terms: -6.666666665 + x = -11.244751861 Solving -6.666666665 + x = -11.244751861 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = -11.244751861 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = -11.244751861 + 6.666666665 x = -11.244751861 + 6.666666665 Combine like terms: -11.244751861 + 6.666666665 = -4.578085196 x = -4.578085196 Simplifying x = -4.578085196

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.911418526, -4.578085196}

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