25=-.25(x^2-100x)

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Solution for 25=-.25(x^2-100x) equation:


Simplifying
25 = -0.25(x2 + -100x)

Reorder the terms:
25 = -0.25(-100x + x2)
25 = (-100x * -0.25 + x2 * -0.25)
25 = (25x + -0.25x2)

Solving
25 = 25x + -0.25x2

Solving for variable 'x'.

Reorder the terms:
25 + -25x + 0.25x2 = 25x + -25x + -0.25x2 + 0.25x2

Combine like terms: 25x + -25x = 0
25 + -25x + 0.25x2 = 0 + -0.25x2 + 0.25x2
25 + -25x + 0.25x2 = -0.25x2 + 0.25x2

Combine like terms: -0.25x2 + 0.25x2 = 0.00
25 + -25x + 0.25x2 = 0.00

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

Divide each side by '0.25'.
100 + -100x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = -100 + 2500

Reorder the terms:
2500 + -100x + x2 = -100 + 2500

Combine like terms: -100 + 2500 = 2400
2500 + -100x + x2 = 2400

Factor a perfect square on the left side:
(x + -50)(x + -50) = 2400

Calculate the square root of the right side: 48.989794856

Break this problem into two subproblems by setting 
(x + -50) equal to 48.989794856 and -48.989794856.

Subproblem 1

x + -50 = 48.989794856 Simplifying x + -50 = 48.989794856 Reorder the terms: -50 + x = 48.989794856 Solving -50 + x = 48.989794856 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 48.989794856 + 50 Combine like terms: -50 + 50 = 0 0 + x = 48.989794856 + 50 x = 48.989794856 + 50 Combine like terms: 48.989794856 + 50 = 98.989794856 x = 98.989794856 Simplifying x = 98.989794856

Subproblem 2

x + -50 = -48.989794856 Simplifying x + -50 = -48.989794856 Reorder the terms: -50 + x = -48.989794856 Solving -50 + x = -48.989794856 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -48.989794856 + 50 Combine like terms: -50 + 50 = 0 0 + x = -48.989794856 + 50 x = -48.989794856 + 50 Combine like terms: -48.989794856 + 50 = 1.010205144 x = 1.010205144 Simplifying x = 1.010205144

Solution

The solution to the problem is based on the solutions from the subproblems. x = {98.989794856, 1.010205144}

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