g^2-8g=-9

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Solution for g^2-8g=-9 equation:


Simplifying
g2 + -8g = -9

Reorder the terms:
-8g + g2 = -9

Solving
-8g + g2 = -9

Solving for variable 'g'.

Reorder the terms:
9 + -8g + g2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + -8g + g2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -8g + -9 + g2 = 0 + -9

Reorder the terms:
9 + -9 + -8g + g2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -8g + g2 = 0 + -9
-8g + g2 = 0 + -9

Combine like terms: 0 + -9 = -9
-8g + g2 = -9

The g term is -8g.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8g + 16 + g2 = -9 + 16

Reorder the terms:
16 + -8g + g2 = -9 + 16

Combine like terms: -9 + 16 = 7
16 + -8g + g2 = 7

Factor a perfect square on the left side:
(g + -4)(g + -4) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(g + -4) equal to 2.645751311 and -2.645751311.

Subproblem 1

g + -4 = 2.645751311 Simplifying g + -4 = 2.645751311 Reorder the terms: -4 + g = 2.645751311 Solving -4 + g = 2.645751311 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + g = 2.645751311 + 4 Combine like terms: -4 + 4 = 0 0 + g = 2.645751311 + 4 g = 2.645751311 + 4 Combine like terms: 2.645751311 + 4 = 6.645751311 g = 6.645751311 Simplifying g = 6.645751311

Subproblem 2

g + -4 = -2.645751311 Simplifying g + -4 = -2.645751311 Reorder the terms: -4 + g = -2.645751311 Solving -4 + g = -2.645751311 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + g = -2.645751311 + 4 Combine like terms: -4 + 4 = 0 0 + g = -2.645751311 + 4 g = -2.645751311 + 4 Combine like terms: -2.645751311 + 4 = 1.354248689 g = 1.354248689 Simplifying g = 1.354248689

Solution

The solution to the problem is based on the solutions from the subproblems. g = {6.645751311, 1.354248689}

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