9f^2-8f-2=0

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Solution for 9f^2-8f-2=0 equation:


Simplifying
9f2 + -8f + -2 = 0

Reorder the terms:
-2 + -8f + 9f2 = 0

Solving
-2 + -8f + 9f2 = 0

Solving for variable 'f'.

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

Divide each side by '9'.
-0.2222222222 + -0.8888888889f + f2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -0.8888888889f + 0.2222222222 + f2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -0.8888888889f + f2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -0.8888888889f + f2 = 0 + 0.2222222222
-0.8888888889f + f2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-0.8888888889f + f2 = 0.2222222222

The f term is -0.8888888889f.  Take half its coefficient (-0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
-0.8888888889f + 0.1975308642 + f2 = 0.2222222222 + 0.1975308642

Reorder the terms:
0.1975308642 + -0.8888888889f + f2 = 0.2222222222 + 0.1975308642

Combine like terms: 0.2222222222 + 0.1975308642 = 0.4197530864
0.1975308642 + -0.8888888889f + f2 = 0.4197530864

Factor a perfect square on the left side:
(f + -0.4444444445)(f + -0.4444444445) = 0.4197530864

Calculate the square root of the right side: 0.647883544

Break this problem into two subproblems by setting 
(f + -0.4444444445) equal to 0.647883544 and -0.647883544.

Subproblem 1

f + -0.4444444445 = 0.647883544 Simplifying f + -0.4444444445 = 0.647883544 Reorder the terms: -0.4444444445 + f = 0.647883544 Solving -0.4444444445 + f = 0.647883544 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + f = 0.647883544 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + f = 0.647883544 + 0.4444444445 f = 0.647883544 + 0.4444444445 Combine like terms: 0.647883544 + 0.4444444445 = 1.0923279885 f = 1.0923279885 Simplifying f = 1.0923279885

Subproblem 2

f + -0.4444444445 = -0.647883544 Simplifying f + -0.4444444445 = -0.647883544 Reorder the terms: -0.4444444445 + f = -0.647883544 Solving -0.4444444445 + f = -0.647883544 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + f = -0.647883544 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + f = -0.647883544 + 0.4444444445 f = -0.647883544 + 0.4444444445 Combine like terms: -0.647883544 + 0.4444444445 = -0.2034390995 f = -0.2034390995 Simplifying f = -0.2034390995

Solution

The solution to the problem is based on the solutions from the subproblems. f = {1.0923279885, -0.2034390995}

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