10=10x-0.2x^2

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Solution for 10=10x-0.2x^2 equation:


Simplifying
10 = 10x + -0.2x2

Solving
10 = 10x + -0.2x2

Solving for variable 'x'.

Reorder the terms:
10 + -10x + 0.2x2 = 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 10x + -10x = 0
10 + -10x + 0.2x2 = 0 + -0.2x2 + 0.2x2
10 + -10x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
10 + -10x + 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'.
50 + -50x + x2 = 0

Move the constant term to the right:

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

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

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

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

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 = -50 + 625

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

Combine like terms: -50 + 625 = 575
625 + -50x + x2 = 575

Factor a perfect square on the left side:
(x + -25)(x + -25) = 575

Calculate the square root of the right side: 23.979157617

Break this problem into two subproblems by setting 
(x + -25) equal to 23.979157617 and -23.979157617.

Subproblem 1

x + -25 = 23.979157617 Simplifying x + -25 = 23.979157617 Reorder the terms: -25 + x = 23.979157617 Solving -25 + x = 23.979157617 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 = 23.979157617 + 25 Combine like terms: -25 + 25 = 0 0 + x = 23.979157617 + 25 x = 23.979157617 + 25 Combine like terms: 23.979157617 + 25 = 48.979157617 x = 48.979157617 Simplifying x = 48.979157617

Subproblem 2

x + -25 = -23.979157617 Simplifying x + -25 = -23.979157617 Reorder the terms: -25 + x = -23.979157617 Solving -25 + x = -23.979157617 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 = -23.979157617 + 25 Combine like terms: -25 + 25 = 0 0 + x = -23.979157617 + 25 x = -23.979157617 + 25 Combine like terms: -23.979157617 + 25 = 1.020842383 x = 1.020842383 Simplifying x = 1.020842383

Solution

The solution to the problem is based on the solutions from the subproblems. x = {48.979157617, 1.020842383}

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