2.2x-0.001x^2=0.4x+60

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Solution for 2.2x-0.001x^2=0.4x+60 equation:


Simplifying
2.2x + -0.001x2 = 0.4x + 60

Reorder the terms:
2.2x + -0.001x2 = 60 + 0.4x

Solving
2.2x + -0.001x2 = 60 + 0.4x

Solving for variable 'x'.

Reorder the terms:
-60 + 2.2x + -0.4x + -0.001x2 = 60 + 0.4x + -60 + -0.4x

Combine like terms: 2.2x + -0.4x = 1.8x
-60 + 1.8x + -0.001x2 = 60 + 0.4x + -60 + -0.4x

Reorder the terms:
-60 + 1.8x + -0.001x2 = 60 + -60 + 0.4x + -0.4x

Combine like terms: 60 + -60 = 0
-60 + 1.8x + -0.001x2 = 0 + 0.4x + -0.4x
-60 + 1.8x + -0.001x2 = 0.4x + -0.4x

Combine like terms: 0.4x + -0.4x = 0.0
-60 + 1.8x + -0.001x2 = 0.0

Begin completing the square.  Divide all terms by
-0.001 the coefficient of the squared term: 

Divide each side by '-0.001'.
60000 + -1800x + x2 = 0

Move the constant term to the right:

Add '-60000' to each side of the equation.
60000 + -1800x + -60000 + x2 = 0 + -60000

Reorder the terms:
60000 + -60000 + -1800x + x2 = 0 + -60000

Combine like terms: 60000 + -60000 = 0
0 + -1800x + x2 = 0 + -60000
-1800x + x2 = 0 + -60000

Combine like terms: 0 + -60000 = -60000
-1800x + x2 = -60000

The x term is -1800x.  Take half its coefficient (-900).
Square it (810000) and add it to both sides.

Add '810000' to each side of the equation.
-1800x + 810000 + x2 = -60000 + 810000

Reorder the terms:
810000 + -1800x + x2 = -60000 + 810000

Combine like terms: -60000 + 810000 = 750000
810000 + -1800x + x2 = 750000

Factor a perfect square on the left side:
(x + -900)(x + -900) = 750000

Calculate the square root of the right side: 866.025403784

Break this problem into two subproblems by setting 
(x + -900) equal to 866.025403784 and -866.025403784.

Subproblem 1

x + -900 = 866.025403784 Simplifying x + -900 = 866.025403784 Reorder the terms: -900 + x = 866.025403784 Solving -900 + x = 866.025403784 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '900' to each side of the equation. -900 + 900 + x = 866.025403784 + 900 Combine like terms: -900 + 900 = 0 0 + x = 866.025403784 + 900 x = 866.025403784 + 900 Combine like terms: 866.025403784 + 900 = 1766.025403784 x = 1766.025403784 Simplifying x = 1766.025403784

Subproblem 2

x + -900 = -866.025403784 Simplifying x + -900 = -866.025403784 Reorder the terms: -900 + x = -866.025403784 Solving -900 + x = -866.025403784 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '900' to each side of the equation. -900 + 900 + x = -866.025403784 + 900 Combine like terms: -900 + 900 = 0 0 + x = -866.025403784 + 900 x = -866.025403784 + 900 Combine like terms: -866.025403784 + 900 = 33.974596216 x = 33.974596216 Simplifying x = 33.974596216

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1766.025403784, 33.974596216}

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