40*x-x*x=60

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Solution for 40*x-x*x=60 equation:


Simplifying
40x + -1x * x = 60

Multiply x * x
40x + -1x2 = 60

Solving
40x + -1x2 = 60

Solving for variable 'x'.

Reorder the terms:
-60 + 40x + -1x2 = 60 + -60

Combine like terms: 60 + -60 = 0
-60 + 40x + -1x2 = 0

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

Divide each side by '-1'.
60 + -40x + x2 = 0

Move the constant term to the right:

Add '-60' to each side of the equation.
60 + -40x + -60 + x2 = 0 + -60

Reorder the terms:
60 + -60 + -40x + x2 = 0 + -60

Combine like terms: 60 + -60 = 0
0 + -40x + x2 = 0 + -60
-40x + x2 = 0 + -60

Combine like terms: 0 + -60 = -60
-40x + x2 = -60

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = -60 + 400

Reorder the terms:
400 + -40x + x2 = -60 + 400

Combine like terms: -60 + 400 = 340
400 + -40x + x2 = 340

Factor a perfect square on the left side:
(x + -20)(x + -20) = 340

Calculate the square root of the right side: 18.439088915

Break this problem into two subproblems by setting 
(x + -20) equal to 18.439088915 and -18.439088915.

Subproblem 1

x + -20 = 18.439088915 Simplifying x + -20 = 18.439088915 Reorder the terms: -20 + x = 18.439088915 Solving -20 + x = 18.439088915 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 18.439088915 + 20 Combine like terms: -20 + 20 = 0 0 + x = 18.439088915 + 20 x = 18.439088915 + 20 Combine like terms: 18.439088915 + 20 = 38.439088915 x = 38.439088915 Simplifying x = 38.439088915

Subproblem 2

x + -20 = -18.439088915 Simplifying x + -20 = -18.439088915 Reorder the terms: -20 + x = -18.439088915 Solving -20 + x = -18.439088915 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -18.439088915 + 20 Combine like terms: -20 + 20 = 0 0 + x = -18.439088915 + 20 x = -18.439088915 + 20 Combine like terms: -18.439088915 + 20 = 1.560911085 x = 1.560911085 Simplifying x = 1.560911085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.439088915, 1.560911085}

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