g^2-7g-1=0

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Solution for g^2-7g-1=0 equation:


Simplifying
g2 + -7g + -1 = 0

Reorder the terms:
-1 + -7g + g2 = 0

Solving
-1 + -7g + g2 = 0

Solving for variable 'g'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -7g + 1 + g2 = 0 + 1

Reorder the terms:
-1 + 1 + -7g + g2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -7g + g2 = 0 + 1
-7g + g2 = 0 + 1

Combine like terms: 0 + 1 = 1
-7g + g2 = 1

The g term is -7g.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7g + 12.25 + g2 = 1 + 12.25

Reorder the terms:
12.25 + -7g + g2 = 1 + 12.25

Combine like terms: 1 + 12.25 = 13.25
12.25 + -7g + g2 = 13.25

Factor a perfect square on the left side:
(g + -3.5)(g + -3.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(g + -3.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

g + -3.5 = 3.640054945 Simplifying g + -3.5 = 3.640054945 Reorder the terms: -3.5 + g = 3.640054945 Solving -3.5 + g = 3.640054945 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + g = 3.640054945 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + g = 3.640054945 + 3.5 g = 3.640054945 + 3.5 Combine like terms: 3.640054945 + 3.5 = 7.140054945 g = 7.140054945 Simplifying g = 7.140054945

Subproblem 2

g + -3.5 = -3.640054945 Simplifying g + -3.5 = -3.640054945 Reorder the terms: -3.5 + g = -3.640054945 Solving -3.5 + g = -3.640054945 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + g = -3.640054945 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + g = -3.640054945 + 3.5 g = -3.640054945 + 3.5 Combine like terms: -3.640054945 + 3.5 = -0.140054945 g = -0.140054945 Simplifying g = -0.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. g = {7.140054945, -0.140054945}

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