3x=.01x^2+.8x+40

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Solution for 3x=.01x^2+.8x+40 equation:


Simplifying
3x = 0.01x2 + 0.8x + 40

Reorder the terms:
3x = 40 + 0.8x + 0.01x2

Solving
3x = 40 + 0.8x + 0.01x2

Solving for variable 'x'.

Reorder the terms:
-40 + 3x + -0.8x + -0.01x2 = 40 + 0.8x + 0.01x2 + -40 + -0.8x + -0.01x2

Combine like terms: 3x + -0.8x = 2.2x
-40 + 2.2x + -0.01x2 = 40 + 0.8x + 0.01x2 + -40 + -0.8x + -0.01x2

Reorder the terms:
-40 + 2.2x + -0.01x2 = 40 + -40 + 0.8x + -0.8x + 0.01x2 + -0.01x2

Combine like terms: 40 + -40 = 0
-40 + 2.2x + -0.01x2 = 0 + 0.8x + -0.8x + 0.01x2 + -0.01x2
-40 + 2.2x + -0.01x2 = 0.8x + -0.8x + 0.01x2 + -0.01x2

Combine like terms: 0.8x + -0.8x = 0.0
-40 + 2.2x + -0.01x2 = 0.0 + 0.01x2 + -0.01x2
-40 + 2.2x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
-40 + 2.2x + -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'.
4000 + -220x + x2 = 0

Move the constant term to the right:

Add '-4000' to each side of the equation.
4000 + -220x + -4000 + x2 = 0 + -4000

Reorder the terms:
4000 + -4000 + -220x + x2 = 0 + -4000

Combine like terms: 4000 + -4000 = 0
0 + -220x + x2 = 0 + -4000
-220x + x2 = 0 + -4000

Combine like terms: 0 + -4000 = -4000
-220x + x2 = -4000

The x term is -220x.  Take half its coefficient (-110).
Square it (12100) and add it to both sides.

Add '12100' to each side of the equation.
-220x + 12100 + x2 = -4000 + 12100

Reorder the terms:
12100 + -220x + x2 = -4000 + 12100

Combine like terms: -4000 + 12100 = 8100
12100 + -220x + x2 = 8100

Factor a perfect square on the left side:
(x + -110)(x + -110) = 8100

Calculate the square root of the right side: 90

Break this problem into two subproblems by setting 
(x + -110) equal to 90 and -90.

Subproblem 1

x + -110 = 90 Simplifying x + -110 = 90 Reorder the terms: -110 + x = 90 Solving -110 + x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '110' to each side of the equation. -110 + 110 + x = 90 + 110 Combine like terms: -110 + 110 = 0 0 + x = 90 + 110 x = 90 + 110 Combine like terms: 90 + 110 = 200 x = 200 Simplifying x = 200

Subproblem 2

x + -110 = -90 Simplifying x + -110 = -90 Reorder the terms: -110 + x = -90 Solving -110 + x = -90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '110' to each side of the equation. -110 + 110 + x = -90 + 110 Combine like terms: -110 + 110 = 0 0 + x = -90 + 110 x = -90 + 110 Combine like terms: -90 + 110 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {200, 20}

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