q^2+2q-16=0

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Solution for q^2+2q-16=0 equation:


Simplifying
q2 + 2q + -16 = 0

Reorder the terms:
-16 + 2q + q2 = 0

Solving
-16 + 2q + q2 = 0

Solving for variable 'q'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 2q + 16 + q2 = 0 + 16

Reorder the terms:
-16 + 16 + 2q + q2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 2q + q2 = 0 + 16
2q + q2 = 0 + 16

Combine like terms: 0 + 16 = 16
2q + q2 = 16

The q term is 2q.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2q + 1 + q2 = 16 + 1

Reorder the terms:
1 + 2q + q2 = 16 + 1

Combine like terms: 16 + 1 = 17
1 + 2q + q2 = 17

Factor a perfect square on the left side:
(q + 1)(q + 1) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(q + 1) equal to 4.123105626 and -4.123105626.

Subproblem 1

q + 1 = 4.123105626 Simplifying q + 1 = 4.123105626 Reorder the terms: 1 + q = 4.123105626 Solving 1 + q = 4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + q = 4.123105626 + -1 Combine like terms: 1 + -1 = 0 0 + q = 4.123105626 + -1 q = 4.123105626 + -1 Combine like terms: 4.123105626 + -1 = 3.123105626 q = 3.123105626 Simplifying q = 3.123105626

Subproblem 2

q + 1 = -4.123105626 Simplifying q + 1 = -4.123105626 Reorder the terms: 1 + q = -4.123105626 Solving 1 + q = -4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + q = -4.123105626 + -1 Combine like terms: 1 + -1 = 0 0 + q = -4.123105626 + -1 q = -4.123105626 + -1 Combine like terms: -4.123105626 + -1 = -5.123105626 q = -5.123105626 Simplifying q = -5.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. q = {3.123105626, -5.123105626}

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