g^2+2g+0.4=0.9g^2

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Solution for g^2+2g+0.4=0.9g^2 equation:


Simplifying
g2 + 2g + 0.4 = 0.9g2

Reorder the terms:
0.4 + 2g + g2 = 0.9g2

Solving
0.4 + 2g + g2 = 0.9g2

Solving for variable 'g'.

Combine like terms: g2 + -0.9g2 = 0.1g2
0.4 + 2g + 0.1g2 = 0.9g2 + -0.9g2

Combine like terms: 0.9g2 + -0.9g2 = 0.0
0.4 + 2g + 0.1g2 = 0.0

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

Divide each side by '0.1'.
4 + 20g + g2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 20g + -4 + g2 = 0 + -4

Reorder the terms:
4 + -4 + 20g + g2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 20g + g2 = 0 + -4
20g + g2 = 0 + -4

Combine like terms: 0 + -4 = -4
20g + g2 = -4

The g term is 20g.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20g + 100 + g2 = -4 + 100

Reorder the terms:
100 + 20g + g2 = -4 + 100

Combine like terms: -4 + 100 = 96
100 + 20g + g2 = 96

Factor a perfect square on the left side:
(g + 10)(g + 10) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(g + 10) equal to 9.797958971 and -9.797958971.

Subproblem 1

g + 10 = 9.797958971 Simplifying g + 10 = 9.797958971 Reorder the terms: 10 + g = 9.797958971 Solving 10 + g = 9.797958971 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + g = 9.797958971 + -10 Combine like terms: 10 + -10 = 0 0 + g = 9.797958971 + -10 g = 9.797958971 + -10 Combine like terms: 9.797958971 + -10 = -0.202041029 g = -0.202041029 Simplifying g = -0.202041029

Subproblem 2

g + 10 = -9.797958971 Simplifying g + 10 = -9.797958971 Reorder the terms: 10 + g = -9.797958971 Solving 10 + g = -9.797958971 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + g = -9.797958971 + -10 Combine like terms: 10 + -10 = 0 0 + g = -9.797958971 + -10 g = -9.797958971 + -10 Combine like terms: -9.797958971 + -10 = -19.797958971 g = -19.797958971 Simplifying g = -19.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. g = {-0.202041029, -19.797958971}

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