8f^2-6f-7=0

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Solution for 8f^2-6f-7=0 equation:


Simplifying
8f2 + -6f + -7 = 0

Reorder the terms:
-7 + -6f + 8f2 = 0

Solving
-7 + -6f + 8f2 = 0

Solving for variable 'f'.

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

Divide each side by '8'.
-0.875 + -0.75f + f2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -0.75f + 0.875 + f2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -0.75f + f2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -0.75f + f2 = 0 + 0.875
-0.75f + f2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-0.75f + f2 = 0.875

The f term is -0.75f.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75f + 0.140625 + f2 = 0.875 + 0.140625

Reorder the terms:
0.140625 + -0.75f + f2 = 0.875 + 0.140625

Combine like terms: 0.875 + 0.140625 = 1.015625
0.140625 + -0.75f + f2 = 1.015625

Factor a perfect square on the left side:
(f + -0.375)(f + -0.375) = 1.015625

Calculate the square root of the right side: 1.007782219

Break this problem into two subproblems by setting 
(f + -0.375) equal to 1.007782219 and -1.007782219.

Subproblem 1

f + -0.375 = 1.007782219 Simplifying f + -0.375 = 1.007782219 Reorder the terms: -0.375 + f = 1.007782219 Solving -0.375 + f = 1.007782219 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + f = 1.007782219 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + f = 1.007782219 + 0.375 f = 1.007782219 + 0.375 Combine like terms: 1.007782219 + 0.375 = 1.382782219 f = 1.382782219 Simplifying f = 1.382782219

Subproblem 2

f + -0.375 = -1.007782219 Simplifying f + -0.375 = -1.007782219 Reorder the terms: -0.375 + f = -1.007782219 Solving -0.375 + f = -1.007782219 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + f = -1.007782219 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + f = -1.007782219 + 0.375 f = -1.007782219 + 0.375 Combine like terms: -1.007782219 + 0.375 = -0.632782219 f = -0.632782219 Simplifying f = -0.632782219

Solution

The solution to the problem is based on the solutions from the subproblems. f = {1.382782219, -0.632782219}

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