-5g(8-g)=12

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Solution for -5g(8-g)=12 equation:


Simplifying
-5g(8 + -1g) = 12
(8 * -5g + -1g * -5g) = 12
(-40g + 5g2) = 12

Solving
-40g + 5g2 = 12

Solving for variable 'g'.

Reorder the terms:
-12 + -40g + 5g2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -40g + 5g2 = 0

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

Divide each side by '5'.
-2.4 + -8g + g2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -8g + 2.4 + g2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -8g + g2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -8g + g2 = 0 + 2.4
-8g + g2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-8g + g2 = 2.4

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 = 2.4 + 16

Reorder the terms:
16 + -8g + g2 = 2.4 + 16

Combine like terms: 2.4 + 16 = 18.4
16 + -8g + g2 = 18.4

Factor a perfect square on the left side:
(g + -4)(g + -4) = 18.4

Calculate the square root of the right side: 4.289522118

Break this problem into two subproblems by setting 
(g + -4) equal to 4.289522118 and -4.289522118.

Subproblem 1

g + -4 = 4.289522118 Simplifying g + -4 = 4.289522118 Reorder the terms: -4 + g = 4.289522118 Solving -4 + g = 4.289522118 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 = 4.289522118 + 4 Combine like terms: -4 + 4 = 0 0 + g = 4.289522118 + 4 g = 4.289522118 + 4 Combine like terms: 4.289522118 + 4 = 8.289522118 g = 8.289522118 Simplifying g = 8.289522118

Subproblem 2

g + -4 = -4.289522118 Simplifying g + -4 = -4.289522118 Reorder the terms: -4 + g = -4.289522118 Solving -4 + g = -4.289522118 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 = -4.289522118 + 4 Combine like terms: -4 + 4 = 0 0 + g = -4.289522118 + 4 g = -4.289522118 + 4 Combine like terms: -4.289522118 + 4 = -0.289522118 g = -0.289522118 Simplifying g = -0.289522118

Solution

The solution to the problem is based on the solutions from the subproblems. g = {8.289522118, -0.289522118}

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