10=-.01x^2+4x

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Solution for 10=-.01x^2+4x equation:


Simplifying
10 = -0.01x2 + 4x

Reorder the terms:
10 = 4x + -0.01x2

Solving
10 = 4x + -0.01x2

Solving for variable 'x'.

Reorder the terms:
10 + -4x + 0.01x2 = 4x + -4x + -0.01x2 + 0.01x2

Combine like terms: 4x + -4x = 0
10 + -4x + 0.01x2 = 0 + -0.01x2 + 0.01x2
10 + -4x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
10 + -4x + 0.01x2 = 0.00

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

Divide each side by '0.01'.
1000 + -400x + x2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + -400x + -1000 + x2 = 0 + -1000

Reorder the terms:
1000 + -1000 + -400x + x2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + -400x + x2 = 0 + -1000
-400x + x2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
-400x + x2 = -1000

The x term is -400x.  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
-400x + 40000 + x2 = -1000 + 40000

Reorder the terms:
40000 + -400x + x2 = -1000 + 40000

Combine like terms: -1000 + 40000 = 39000
40000 + -400x + x2 = 39000

Factor a perfect square on the left side:
(x + -200)(x + -200) = 39000

Calculate the square root of the right side: 197.484176581

Break this problem into two subproblems by setting 
(x + -200) equal to 197.484176581 and -197.484176581.

Subproblem 1

x + -200 = 197.484176581 Simplifying x + -200 = 197.484176581 Reorder the terms: -200 + x = 197.484176581 Solving -200 + x = 197.484176581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = 197.484176581 + 200 Combine like terms: -200 + 200 = 0 0 + x = 197.484176581 + 200 x = 197.484176581 + 200 Combine like terms: 197.484176581 + 200 = 397.484176581 x = 397.484176581 Simplifying x = 397.484176581

Subproblem 2

x + -200 = -197.484176581 Simplifying x + -200 = -197.484176581 Reorder the terms: -200 + x = -197.484176581 Solving -200 + x = -197.484176581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = -197.484176581 + 200 Combine like terms: -200 + 200 = 0 0 + x = -197.484176581 + 200 x = -197.484176581 + 200 Combine like terms: -197.484176581 + 200 = 2.515823419 x = 2.515823419 Simplifying x = 2.515823419

Solution

The solution to the problem is based on the solutions from the subproblems. x = {397.484176581, 2.515823419}

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