g^2-4g-30=0

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Solution for g^2-4g-30=0 equation:


Simplifying
g2 + -4g + -30 = 0

Reorder the terms:
-30 + -4g + g2 = 0

Solving
-30 + -4g + g2 = 0

Solving for variable 'g'.

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -4g + 30 + g2 = 0 + 30

Reorder the terms:
-30 + 30 + -4g + g2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -4g + g2 = 0 + 30
-4g + g2 = 0 + 30

Combine like terms: 0 + 30 = 30
-4g + g2 = 30

The g term is -4g.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4g + 4 + g2 = 30 + 4

Reorder the terms:
4 + -4g + g2 = 30 + 4

Combine like terms: 30 + 4 = 34
4 + -4g + g2 = 34

Factor a perfect square on the left side:
(g + -2)(g + -2) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(g + -2) equal to 5.830951895 and -5.830951895.

Subproblem 1

g + -2 = 5.830951895 Simplifying g + -2 = 5.830951895 Reorder the terms: -2 + g = 5.830951895 Solving -2 + g = 5.830951895 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + g = 5.830951895 + 2 Combine like terms: -2 + 2 = 0 0 + g = 5.830951895 + 2 g = 5.830951895 + 2 Combine like terms: 5.830951895 + 2 = 7.830951895 g = 7.830951895 Simplifying g = 7.830951895

Subproblem 2

g + -2 = -5.830951895 Simplifying g + -2 = -5.830951895 Reorder the terms: -2 + g = -5.830951895 Solving -2 + g = -5.830951895 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + g = -5.830951895 + 2 Combine like terms: -2 + 2 = 0 0 + g = -5.830951895 + 2 g = -5.830951895 + 2 Combine like terms: -5.830951895 + 2 = -3.830951895 g = -3.830951895 Simplifying g = -3.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. g = {7.830951895, -3.830951895}

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