10=0.1x^2+4x

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Solution for 10=0.1x^2+4x equation:


Simplifying
10 = 0.1x2 + 4x

Reorder the terms:
10 = 4x + 0.1x2

Solving
10 = 4x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
10 + -4x + -0.1x2 = 4x + -4x + 0.1x2 + -0.1x2

Combine like terms: 4x + -4x = 0
10 + -4x + -0.1x2 = 0 + 0.1x2 + -0.1x2
10 + -4x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
10 + -4x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
-100 + 40x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 40x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 40x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 40x + x2 = 0 + 100
40x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
40x + x2 = 100

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = 100 + 400

Reorder the terms:
400 + 40x + x2 = 100 + 400

Combine like terms: 100 + 400 = 500
400 + 40x + x2 = 500

Factor a perfect square on the left side:
(x + 20)(x + 20) = 500

Calculate the square root of the right side: 22.360679775

Break this problem into two subproblems by setting 
(x + 20) equal to 22.360679775 and -22.360679775.

Subproblem 1

x + 20 = 22.360679775 Simplifying x + 20 = 22.360679775 Reorder the terms: 20 + x = 22.360679775 Solving 20 + x = 22.360679775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 22.360679775 + -20 Combine like terms: 20 + -20 = 0 0 + x = 22.360679775 + -20 x = 22.360679775 + -20 Combine like terms: 22.360679775 + -20 = 2.360679775 x = 2.360679775 Simplifying x = 2.360679775

Subproblem 2

x + 20 = -22.360679775 Simplifying x + 20 = -22.360679775 Reorder the terms: 20 + x = -22.360679775 Solving 20 + x = -22.360679775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -22.360679775 + -20 Combine like terms: 20 + -20 = 0 0 + x = -22.360679775 + -20 x = -22.360679775 + -20 Combine like terms: -22.360679775 + -20 = -42.360679775 x = -42.360679775 Simplifying x = -42.360679775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.360679775, -42.360679775}

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