-x^2+50x=100

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Solution for -x^2+50x=100 equation:


Simplifying
-1x2 + 50x = 100

Reorder the terms:
50x + -1x2 = 100

Solving
50x + -1x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + 50x + -1x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 50x + -1x2 = 0

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

Divide each side by '-1'.
100 + -50x + x2 = 0

Move the constant term to the right:

Add '-100' to each side of the equation.
100 + -50x + -100 + x2 = 0 + -100

Reorder the terms:
100 + -100 + -50x + x2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -50x + x2 = 0 + -100
-50x + x2 = 0 + -100

Combine like terms: 0 + -100 = -100
-50x + x2 = -100

The x term is -50x.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50x + 625 + x2 = -100 + 625

Reorder the terms:
625 + -50x + x2 = -100 + 625

Combine like terms: -100 + 625 = 525
625 + -50x + x2 = 525

Factor a perfect square on the left side:
(x + -25)(x + -25) = 525

Calculate the square root of the right side: 22.912878475

Break this problem into two subproblems by setting 
(x + -25) equal to 22.912878475 and -22.912878475.

Subproblem 1

x + -25 = 22.912878475 Simplifying x + -25 = 22.912878475 Reorder the terms: -25 + x = 22.912878475 Solving -25 + x = 22.912878475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = 22.912878475 + 25 Combine like terms: -25 + 25 = 0 0 + x = 22.912878475 + 25 x = 22.912878475 + 25 Combine like terms: 22.912878475 + 25 = 47.912878475 x = 47.912878475 Simplifying x = 47.912878475

Subproblem 2

x + -25 = -22.912878475 Simplifying x + -25 = -22.912878475 Reorder the terms: -25 + x = -22.912878475 Solving -25 + x = -22.912878475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = -22.912878475 + 25 Combine like terms: -25 + 25 = 0 0 + x = -22.912878475 + 25 x = -22.912878475 + 25 Combine like terms: -22.912878475 + 25 = 2.087121525 x = 2.087121525 Simplifying x = 2.087121525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {47.912878475, 2.087121525}

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