10x-.04x^2=400

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Solution for 10x-.04x^2=400 equation:


Simplifying
10x + -0.04x2 = 400

Solving
10x + -0.04x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 10x + -0.04x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 10x + -0.04x2 = 0

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
10000 + -250x + x2 = 0

Move the constant term to the right:

Add '-10000' to each side of the equation.
10000 + -250x + -10000 + x2 = 0 + -10000

Reorder the terms:
10000 + -10000 + -250x + x2 = 0 + -10000

Combine like terms: 10000 + -10000 = 0
0 + -250x + x2 = 0 + -10000
-250x + x2 = 0 + -10000

Combine like terms: 0 + -10000 = -10000
-250x + x2 = -10000

The x term is -250x.  Take half its coefficient (-125).
Square it (15625) and add it to both sides.

Add '15625' to each side of the equation.
-250x + 15625 + x2 = -10000 + 15625

Reorder the terms:
15625 + -250x + x2 = -10000 + 15625

Combine like terms: -10000 + 15625 = 5625
15625 + -250x + x2 = 5625

Factor a perfect square on the left side:
(x + -125)(x + -125) = 5625

Calculate the square root of the right side: 75

Break this problem into two subproblems by setting 
(x + -125) equal to 75 and -75.

Subproblem 1

x + -125 = 75 Simplifying x + -125 = 75 Reorder the terms: -125 + x = 75 Solving -125 + x = 75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + x = 75 + 125 Combine like terms: -125 + 125 = 0 0 + x = 75 + 125 x = 75 + 125 Combine like terms: 75 + 125 = 200 x = 200 Simplifying x = 200

Subproblem 2

x + -125 = -75 Simplifying x + -125 = -75 Reorder the terms: -125 + x = -75 Solving -125 + x = -75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + x = -75 + 125 Combine like terms: -125 + 125 = 0 0 + x = -75 + 125 x = -75 + 125 Combine like terms: -75 + 125 = 50 x = 50 Simplifying x = 50

Solution

The solution to the problem is based on the solutions from the subproblems. x = {200, 50}

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