11x=0.1x^2-6x-40

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Solution for 11x=0.1x^2-6x-40 equation:


Simplifying
11x = 0.1x2 + -6x + -40

Reorder the terms:
11x = -40 + -6x + 0.1x2

Solving
11x = -40 + -6x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
40 + 11x + 6x + -0.1x2 = -40 + -6x + 0.1x2 + 40 + 6x + -0.1x2

Combine like terms: 11x + 6x = 17x
40 + 17x + -0.1x2 = -40 + -6x + 0.1x2 + 40 + 6x + -0.1x2

Reorder the terms:
40 + 17x + -0.1x2 = -40 + 40 + -6x + 6x + 0.1x2 + -0.1x2

Combine like terms: -40 + 40 = 0
40 + 17x + -0.1x2 = 0 + -6x + 6x + 0.1x2 + -0.1x2
40 + 17x + -0.1x2 = -6x + 6x + 0.1x2 + -0.1x2

Combine like terms: -6x + 6x = 0
40 + 17x + -0.1x2 = 0 + 0.1x2 + -0.1x2
40 + 17x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
40 + 17x + -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'.
-400 + -170x + x2 = 0

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + -170x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + -170x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + -170x + x2 = 0 + 400
-170x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
-170x + x2 = 400

The x term is -170x.  Take half its coefficient (-85).
Square it (7225) and add it to both sides.

Add '7225' to each side of the equation.
-170x + 7225 + x2 = 400 + 7225

Reorder the terms:
7225 + -170x + x2 = 400 + 7225

Combine like terms: 400 + 7225 = 7625
7225 + -170x + x2 = 7625

Factor a perfect square on the left side:
(x + -85)(x + -85) = 7625

Calculate the square root of the right side: 87.321245983

Break this problem into two subproblems by setting 
(x + -85) equal to 87.321245983 and -87.321245983.

Subproblem 1

x + -85 = 87.321245983 Simplifying x + -85 = 87.321245983 Reorder the terms: -85 + x = 87.321245983 Solving -85 + x = 87.321245983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '85' to each side of the equation. -85 + 85 + x = 87.321245983 + 85 Combine like terms: -85 + 85 = 0 0 + x = 87.321245983 + 85 x = 87.321245983 + 85 Combine like terms: 87.321245983 + 85 = 172.321245983 x = 172.321245983 Simplifying x = 172.321245983

Subproblem 2

x + -85 = -87.321245983 Simplifying x + -85 = -87.321245983 Reorder the terms: -85 + x = -87.321245983 Solving -85 + x = -87.321245983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '85' to each side of the equation. -85 + 85 + x = -87.321245983 + 85 Combine like terms: -85 + 85 = 0 0 + x = -87.321245983 + 85 x = -87.321245983 + 85 Combine like terms: -87.321245983 + 85 = -2.321245983 x = -2.321245983 Simplifying x = -2.321245983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {172.321245983, -2.321245983}

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