-g^2+3g+8=0

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Solution for -g^2+3g+8=0 equation:


Simplifying
-1g2 + 3g + 8 = 0

Reorder the terms:
8 + 3g + -1g2 = 0

Solving
8 + 3g + -1g2 = 0

Solving for variable 'g'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + -3g + g2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -3g + 8 + g2 = 0 + 8

Reorder the terms:
-8 + 8 + -3g + g2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -3g + g2 = 0 + 8
-3g + g2 = 0 + 8

Combine like terms: 0 + 8 = 8
-3g + g2 = 8

The g term is -3g.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3g + 2.25 + g2 = 8 + 2.25

Reorder the terms:
2.25 + -3g + g2 = 8 + 2.25

Combine like terms: 8 + 2.25 = 10.25
2.25 + -3g + g2 = 10.25

Factor a perfect square on the left side:
(g + -1.5)(g + -1.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(g + -1.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

g + -1.5 = 3.201562119 Simplifying g + -1.5 = 3.201562119 Reorder the terms: -1.5 + g = 3.201562119 Solving -1.5 + g = 3.201562119 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + g = 3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + g = 3.201562119 + 1.5 g = 3.201562119 + 1.5 Combine like terms: 3.201562119 + 1.5 = 4.701562119 g = 4.701562119 Simplifying g = 4.701562119

Subproblem 2

g + -1.5 = -3.201562119 Simplifying g + -1.5 = -3.201562119 Reorder the terms: -1.5 + g = -3.201562119 Solving -1.5 + g = -3.201562119 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + g = -3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + g = -3.201562119 + 1.5 g = -3.201562119 + 1.5 Combine like terms: -3.201562119 + 1.5 = -1.701562119 g = -1.701562119 Simplifying g = -1.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. g = {4.701562119, -1.701562119}

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