9x-.83x^2=22

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Solution for 9x-.83x^2=22 equation:


Simplifying
9x + -0.83x2 = 22

Solving
9x + -0.83x2 = 22

Solving for variable 'x'.

Reorder the terms:
-22 + 9x + -0.83x2 = 22 + -22

Combine like terms: 22 + -22 = 0
-22 + 9x + -0.83x2 = 0

Begin completing the square.  Divide all terms by
-0.83 the coefficient of the squared term: 

Divide each side by '-0.83'.
26.5060241 + -10.84337349x + x2 = 0

Move the constant term to the right:

Add '-26.5060241' to each side of the equation.
26.5060241 + -10.84337349x + -26.5060241 + x2 = 0 + -26.5060241

Reorder the terms:
26.5060241 + -26.5060241 + -10.84337349x + x2 = 0 + -26.5060241

Combine like terms: 26.5060241 + -26.5060241 = 0.0000000
0.0000000 + -10.84337349x + x2 = 0 + -26.5060241
-10.84337349x + x2 = 0 + -26.5060241

Combine like terms: 0 + -26.5060241 = -26.5060241
-10.84337349x + x2 = -26.5060241

The x term is -10.84337349x.  Take half its coefficient (-5.421686745).
Square it (29.39468716) and add it to both sides.

Add '29.39468716' to each side of the equation.
-10.84337349x + 29.39468716 + x2 = -26.5060241 + 29.39468716

Reorder the terms:
29.39468716 + -10.84337349x + x2 = -26.5060241 + 29.39468716

Combine like terms: -26.5060241 + 29.39468716 = 2.88866306
29.39468716 + -10.84337349x + x2 = 2.88866306

Factor a perfect square on the left side:
(x + -5.421686745)(x + -5.421686745) = 2.88866306

Calculate the square root of the right side: 1.699606737

Break this problem into two subproblems by setting 
(x + -5.421686745) equal to 1.699606737 and -1.699606737.

Subproblem 1

x + -5.421686745 = 1.699606737 Simplifying x + -5.421686745 = 1.699606737 Reorder the terms: -5.421686745 + x = 1.699606737 Solving -5.421686745 + x = 1.699606737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.421686745' to each side of the equation. -5.421686745 + 5.421686745 + x = 1.699606737 + 5.421686745 Combine like terms: -5.421686745 + 5.421686745 = 0.000000000 0.000000000 + x = 1.699606737 + 5.421686745 x = 1.699606737 + 5.421686745 Combine like terms: 1.699606737 + 5.421686745 = 7.121293482 x = 7.121293482 Simplifying x = 7.121293482

Subproblem 2

x + -5.421686745 = -1.699606737 Simplifying x + -5.421686745 = -1.699606737 Reorder the terms: -5.421686745 + x = -1.699606737 Solving -5.421686745 + x = -1.699606737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.421686745' to each side of the equation. -5.421686745 + 5.421686745 + x = -1.699606737 + 5.421686745 Combine like terms: -5.421686745 + 5.421686745 = 0.000000000 0.000000000 + x = -1.699606737 + 5.421686745 x = -1.699606737 + 5.421686745 Combine like terms: -1.699606737 + 5.421686745 = 3.722080008 x = 3.722080008 Simplifying x = 3.722080008

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.121293482, 3.722080008}

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