0=-.2x^2+10x+5

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Solution for 0=-.2x^2+10x+5 equation:


Simplifying
0 = -0.2x2 + 10x + 5

Reorder the terms:
0 = 5 + 10x + -0.2x2

Solving
0 = 5 + 10x + -0.2x2

Solving for variable 'x'.

Combine like terms: 0 + -5 = -5
-5 + -10x + 0.2x2 = 5 + 10x + -0.2x2 + -5 + -10x + 0.2x2

Reorder the terms:
-5 + -10x + 0.2x2 = 5 + -5 + 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 5 + -5 = 0
-5 + -10x + 0.2x2 = 0 + 10x + -10x + -0.2x2 + 0.2x2
-5 + -10x + 0.2x2 = 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 10x + -10x = 0
-5 + -10x + 0.2x2 = 0 + -0.2x2 + 0.2x2
-5 + -10x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
-5 + -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'.
-25 + -50x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -50x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -50x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -50x + x2 = 0 + 25
-50x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-50x + x2 = 25

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 = 25 + 625

Reorder the terms:
625 + -50x + x2 = 25 + 625

Combine like terms: 25 + 625 = 650
625 + -50x + x2 = 650

Factor a perfect square on the left side:
(x + -25)(x + -25) = 650

Calculate the square root of the right side: 25.495097568

Break this problem into two subproblems by setting 
(x + -25) equal to 25.495097568 and -25.495097568.

Subproblem 1

x + -25 = 25.495097568 Simplifying x + -25 = 25.495097568 Reorder the terms: -25 + x = 25.495097568 Solving -25 + x = 25.495097568 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 = 25.495097568 + 25 Combine like terms: -25 + 25 = 0 0 + x = 25.495097568 + 25 x = 25.495097568 + 25 Combine like terms: 25.495097568 + 25 = 50.495097568 x = 50.495097568 Simplifying x = 50.495097568

Subproblem 2

x + -25 = -25.495097568 Simplifying x + -25 = -25.495097568 Reorder the terms: -25 + x = -25.495097568 Solving -25 + x = -25.495097568 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 = -25.495097568 + 25 Combine like terms: -25 + 25 = 0 0 + x = -25.495097568 + 25 x = -25.495097568 + 25 Combine like terms: -25.495097568 + 25 = -0.495097568 x = -0.495097568 Simplifying x = -0.495097568

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50.495097568, -0.495097568}

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