385=25x-0.2x^2

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Solution for 385=25x-0.2x^2 equation:


Simplifying
385 = 25x + -0.2x2

Solving
385 = 25x + -0.2x2

Solving for variable 'x'.

Reorder the terms:
385 + -25x + 0.2x2 = 25x + -25x + -0.2x2 + 0.2x2

Combine like terms: 25x + -25x = 0
385 + -25x + 0.2x2 = 0 + -0.2x2 + 0.2x2
385 + -25x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
385 + -25x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
1925 + -125x + x2 = 0

Move the constant term to the right:

Add '-1925' to each side of the equation.
1925 + -125x + -1925 + x2 = 0 + -1925

Reorder the terms:
1925 + -1925 + -125x + x2 = 0 + -1925

Combine like terms: 1925 + -1925 = 0
0 + -125x + x2 = 0 + -1925
-125x + x2 = 0 + -1925

Combine like terms: 0 + -1925 = -1925
-125x + x2 = -1925

The x term is -125x.  Take half its coefficient (-62.5).
Square it (3906.25) and add it to both sides.

Add '3906.25' to each side of the equation.
-125x + 3906.25 + x2 = -1925 + 3906.25

Reorder the terms:
3906.25 + -125x + x2 = -1925 + 3906.25

Combine like terms: -1925 + 3906.25 = 1981.25
3906.25 + -125x + x2 = 1981.25

Factor a perfect square on the left side:
(x + -62.5)(x + -62.5) = 1981.25

Calculate the square root of the right side: 44.511234537

Break this problem into two subproblems by setting 
(x + -62.5) equal to 44.511234537 and -44.511234537.

Subproblem 1

x + -62.5 = 44.511234537 Simplifying x + -62.5 = 44.511234537 Reorder the terms: -62.5 + x = 44.511234537 Solving -62.5 + x = 44.511234537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '62.5' to each side of the equation. -62.5 + 62.5 + x = 44.511234537 + 62.5 Combine like terms: -62.5 + 62.5 = 0.0 0.0 + x = 44.511234537 + 62.5 x = 44.511234537 + 62.5 Combine like terms: 44.511234537 + 62.5 = 107.011234537 x = 107.011234537 Simplifying x = 107.011234537

Subproblem 2

x + -62.5 = -44.511234537 Simplifying x + -62.5 = -44.511234537 Reorder the terms: -62.5 + x = -44.511234537 Solving -62.5 + x = -44.511234537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '62.5' to each side of the equation. -62.5 + 62.5 + x = -44.511234537 + 62.5 Combine like terms: -62.5 + 62.5 = 0.0 0.0 + x = -44.511234537 + 62.5 x = -44.511234537 + 62.5 Combine like terms: -44.511234537 + 62.5 = 17.988765463 x = 17.988765463 Simplifying x = 17.988765463

Solution

The solution to the problem is based on the solutions from the subproblems. x = {107.011234537, 17.988765463}

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