0=-0.01x^2+0.4x+6.1

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Solution for 0=-0.01x^2+0.4x+6.1 equation:


Simplifying
0 = -0.01x2 + 0.4x + 6.1

Reorder the terms:
0 = 6.1 + 0.4x + -0.01x2

Solving
0 = 6.1 + 0.4x + -0.01x2

Solving for variable 'x'.

Combine like terms: 0 + -6.1 = -6.1
-6.1 + -0.4x + 0.01x2 = 6.1 + 0.4x + -0.01x2 + -6.1 + -0.4x + 0.01x2

Reorder the terms:
-6.1 + -0.4x + 0.01x2 = 6.1 + -6.1 + 0.4x + -0.4x + -0.01x2 + 0.01x2

Combine like terms: 6.1 + -6.1 = 0.0
-6.1 + -0.4x + 0.01x2 = 0.0 + 0.4x + -0.4x + -0.01x2 + 0.01x2
-6.1 + -0.4x + 0.01x2 = 0.4x + -0.4x + -0.01x2 + 0.01x2

Combine like terms: 0.4x + -0.4x = 0.0
-6.1 + -0.4x + 0.01x2 = 0.0 + -0.01x2 + 0.01x2
-6.1 + -0.4x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
-6.1 + -0.4x + 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'.
-610 + -40x + x2 = 0

Move the constant term to the right:

Add '610' to each side of the equation.
-610 + -40x + 610 + x2 = 0 + 610

Reorder the terms:
-610 + 610 + -40x + x2 = 0 + 610

Combine like terms: -610 + 610 = 0
0 + -40x + x2 = 0 + 610
-40x + x2 = 0 + 610

Combine like terms: 0 + 610 = 610
-40x + x2 = 610

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 = 610 + 400

Reorder the terms:
400 + -40x + x2 = 610 + 400

Combine like terms: 610 + 400 = 1010
400 + -40x + x2 = 1010

Factor a perfect square on the left side:
(x + -20)(x + -20) = 1010

Calculate the square root of the right side: 31.780497164

Break this problem into two subproblems by setting 
(x + -20) equal to 31.780497164 and -31.780497164.

Subproblem 1

x + -20 = 31.780497164 Simplifying x + -20 = 31.780497164 Reorder the terms: -20 + x = 31.780497164 Solving -20 + x = 31.780497164 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 = 31.780497164 + 20 Combine like terms: -20 + 20 = 0 0 + x = 31.780497164 + 20 x = 31.780497164 + 20 Combine like terms: 31.780497164 + 20 = 51.780497164 x = 51.780497164 Simplifying x = 51.780497164

Subproblem 2

x + -20 = -31.780497164 Simplifying x + -20 = -31.780497164 Reorder the terms: -20 + x = -31.780497164 Solving -20 + x = -31.780497164 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 = -31.780497164 + 20 Combine like terms: -20 + 20 = 0 0 + x = -31.780497164 + 20 x = -31.780497164 + 20 Combine like terms: -31.780497164 + 20 = -11.780497164 x = -11.780497164 Simplifying x = -11.780497164

Solution

The solution to the problem is based on the solutions from the subproblems. x = {51.780497164, -11.780497164}

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