g^2-16g-21=0

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Solution for g^2-16g-21=0 equation:


Simplifying
g2 + -16g + -21 = 0

Reorder the terms:
-21 + -16g + g2 = 0

Solving
-21 + -16g + g2 = 0

Solving for variable 'g'.

Begin completing the square.

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + -16g + 21 + g2 = 0 + 21

Reorder the terms:
-21 + 21 + -16g + g2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -16g + g2 = 0 + 21
-16g + g2 = 0 + 21

Combine like terms: 0 + 21 = 21
-16g + g2 = 21

The g term is -16g.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16g + 64 + g2 = 21 + 64

Reorder the terms:
64 + -16g + g2 = 21 + 64

Combine like terms: 21 + 64 = 85
64 + -16g + g2 = 85

Factor a perfect square on the left side:
(g + -8)(g + -8) = 85

Calculate the square root of the right side: 9.219544457

Break this problem into two subproblems by setting 
(g + -8) equal to 9.219544457 and -9.219544457.

Subproblem 1

g + -8 = 9.219544457 Simplifying g + -8 = 9.219544457 Reorder the terms: -8 + g = 9.219544457 Solving -8 + g = 9.219544457 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + g = 9.219544457 + 8 Combine like terms: -8 + 8 = 0 0 + g = 9.219544457 + 8 g = 9.219544457 + 8 Combine like terms: 9.219544457 + 8 = 17.219544457 g = 17.219544457 Simplifying g = 17.219544457

Subproblem 2

g + -8 = -9.219544457 Simplifying g + -8 = -9.219544457 Reorder the terms: -8 + g = -9.219544457 Solving -8 + g = -9.219544457 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + g = -9.219544457 + 8 Combine like terms: -8 + 8 = 0 0 + g = -9.219544457 + 8 g = -9.219544457 + 8 Combine like terms: -9.219544457 + 8 = -1.219544457 g = -1.219544457 Simplifying g = -1.219544457

Solution

The solution to the problem is based on the solutions from the subproblems. g = {17.219544457, -1.219544457}

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