40x-x^2=50

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Solution for 40x-x^2=50 equation:


Simplifying
40x + -1x2 = 50

Solving
40x + -1x2 = 50

Solving for variable 'x'.

Reorder the terms:
-50 + 40x + -1x2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + 40x + -1x2 = 0

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

Divide each side by '-1'.
50 + -40x + x2 = 0

Move the constant term to the right:

Add '-50' to each side of the equation.
50 + -40x + -50 + x2 = 0 + -50

Reorder the terms:
50 + -50 + -40x + x2 = 0 + -50

Combine like terms: 50 + -50 = 0
0 + -40x + x2 = 0 + -50
-40x + x2 = 0 + -50

Combine like terms: 0 + -50 = -50
-40x + x2 = -50

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 = -50 + 400

Reorder the terms:
400 + -40x + x2 = -50 + 400

Combine like terms: -50 + 400 = 350
400 + -40x + x2 = 350

Factor a perfect square on the left side:
(x + -20)(x + -20) = 350

Calculate the square root of the right side: 18.708286934

Break this problem into two subproblems by setting 
(x + -20) equal to 18.708286934 and -18.708286934.

Subproblem 1

x + -20 = 18.708286934 Simplifying x + -20 = 18.708286934 Reorder the terms: -20 + x = 18.708286934 Solving -20 + x = 18.708286934 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 = 18.708286934 + 20 Combine like terms: -20 + 20 = 0 0 + x = 18.708286934 + 20 x = 18.708286934 + 20 Combine like terms: 18.708286934 + 20 = 38.708286934 x = 38.708286934 Simplifying x = 38.708286934

Subproblem 2

x + -20 = -18.708286934 Simplifying x + -20 = -18.708286934 Reorder the terms: -20 + x = -18.708286934 Solving -20 + x = -18.708286934 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 = -18.708286934 + 20 Combine like terms: -20 + 20 = 0 0 + x = -18.708286934 + 20 x = -18.708286934 + 20 Combine like terms: -18.708286934 + 20 = 1.291713066 x = 1.291713066 Simplifying x = 1.291713066

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.708286934, 1.291713066}

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