q^2+16q=39

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Solution for q^2+16q=39 equation:


Simplifying
q2 + 16q = 39

Reorder the terms:
16q + q2 = 39

Solving
16q + q2 = 39

Solving for variable 'q'.

Reorder the terms:
-39 + 16q + q2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + 16q + q2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 16q + 39 + q2 = 0 + 39

Reorder the terms:
-39 + 39 + 16q + q2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 16q + q2 = 0 + 39
16q + q2 = 0 + 39

Combine like terms: 0 + 39 = 39
16q + q2 = 39

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

Add '64' to each side of the equation.
16q + 64 + q2 = 39 + 64

Reorder the terms:
64 + 16q + q2 = 39 + 64

Combine like terms: 39 + 64 = 103
64 + 16q + q2 = 103

Factor a perfect square on the left side:
(q + 8)(q + 8) = 103

Calculate the square root of the right side: 10.148891565

Break this problem into two subproblems by setting 
(q + 8) equal to 10.148891565 and -10.148891565.

Subproblem 1

q + 8 = 10.148891565 Simplifying q + 8 = 10.148891565 Reorder the terms: 8 + q = 10.148891565 Solving 8 + q = 10.148891565 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + q = 10.148891565 + -8 Combine like terms: 8 + -8 = 0 0 + q = 10.148891565 + -8 q = 10.148891565 + -8 Combine like terms: 10.148891565 + -8 = 2.148891565 q = 2.148891565 Simplifying q = 2.148891565

Subproblem 2

q + 8 = -10.148891565 Simplifying q + 8 = -10.148891565 Reorder the terms: 8 + q = -10.148891565 Solving 8 + q = -10.148891565 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + q = -10.148891565 + -8 Combine like terms: 8 + -8 = 0 0 + q = -10.148891565 + -8 q = -10.148891565 + -8 Combine like terms: -10.148891565 + -8 = -18.148891565 q = -18.148891565 Simplifying q = -18.148891565

Solution

The solution to the problem is based on the solutions from the subproblems. q = {2.148891565, -18.148891565}

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