12.4*x-x^2-36=0

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Solution for 12.4*x-x^2-36=0 equation:


Simplifying
12.4x + -1x2 + -36 = 0

Reorder the terms:
-36 + 12.4x + -1x2 = 0

Solving
-36 + 12.4x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
36 + -12.4x + x2 = 0

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + -12.4x + -36 + x2 = 0 + -36

Reorder the terms:
36 + -36 + -12.4x + x2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -12.4x + x2 = 0 + -36
-12.4x + x2 = 0 + -36

Combine like terms: 0 + -36 = -36
-12.4x + x2 = -36

The x term is -12.4x.  Take half its coefficient (-6.2).
Square it (38.44) and add it to both sides.

Add '38.44' to each side of the equation.
-12.4x + 38.44 + x2 = -36 + 38.44

Reorder the terms:
38.44 + -12.4x + x2 = -36 + 38.44

Combine like terms: -36 + 38.44 = 2.44
38.44 + -12.4x + x2 = 2.44

Factor a perfect square on the left side:
(x + -6.2)(x + -6.2) = 2.44

Calculate the square root of the right side: 1.562049935

Break this problem into two subproblems by setting 
(x + -6.2) equal to 1.562049935 and -1.562049935.

Subproblem 1

x + -6.2 = 1.562049935 Simplifying x + -6.2 = 1.562049935 Reorder the terms: -6.2 + x = 1.562049935 Solving -6.2 + x = 1.562049935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.2' to each side of the equation. -6.2 + 6.2 + x = 1.562049935 + 6.2 Combine like terms: -6.2 + 6.2 = 0.0 0.0 + x = 1.562049935 + 6.2 x = 1.562049935 + 6.2 Combine like terms: 1.562049935 + 6.2 = 7.762049935 x = 7.762049935 Simplifying x = 7.762049935

Subproblem 2

x + -6.2 = -1.562049935 Simplifying x + -6.2 = -1.562049935 Reorder the terms: -6.2 + x = -1.562049935 Solving -6.2 + x = -1.562049935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.2' to each side of the equation. -6.2 + 6.2 + x = -1.562049935 + 6.2 Combine like terms: -6.2 + 6.2 = 0.0 0.0 + x = -1.562049935 + 6.2 x = -1.562049935 + 6.2 Combine like terms: -1.562049935 + 6.2 = 4.637950065 x = 4.637950065 Simplifying x = 4.637950065

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.762049935, 4.637950065}

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