q^2+18q=-47

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Solution for q^2+18q=-47 equation:


Simplifying
q2 + 18q = -47

Reorder the terms:
18q + q2 = -47

Solving
18q + q2 = -47

Solving for variable 'q'.

Reorder the terms:
47 + 18q + q2 = -47 + 47

Combine like terms: -47 + 47 = 0
47 + 18q + q2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-47' to each side of the equation.
47 + 18q + -47 + q2 = 0 + -47

Reorder the terms:
47 + -47 + 18q + q2 = 0 + -47

Combine like terms: 47 + -47 = 0
0 + 18q + q2 = 0 + -47
18q + q2 = 0 + -47

Combine like terms: 0 + -47 = -47
18q + q2 = -47

The q term is 18q.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18q + 81 + q2 = -47 + 81

Reorder the terms:
81 + 18q + q2 = -47 + 81

Combine like terms: -47 + 81 = 34
81 + 18q + q2 = 34

Factor a perfect square on the left side:
(q + 9)(q + 9) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(q + 9) equal to 5.830951895 and -5.830951895.

Subproblem 1

q + 9 = 5.830951895 Simplifying q + 9 = 5.830951895 Reorder the terms: 9 + q = 5.830951895 Solving 9 + q = 5.830951895 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + q = 5.830951895 + -9 Combine like terms: 9 + -9 = 0 0 + q = 5.830951895 + -9 q = 5.830951895 + -9 Combine like terms: 5.830951895 + -9 = -3.169048105 q = -3.169048105 Simplifying q = -3.169048105

Subproblem 2

q + 9 = -5.830951895 Simplifying q + 9 = -5.830951895 Reorder the terms: 9 + q = -5.830951895 Solving 9 + q = -5.830951895 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + q = -5.830951895 + -9 Combine like terms: 9 + -9 = 0 0 + q = -5.830951895 + -9 q = -5.830951895 + -9 Combine like terms: -5.830951895 + -9 = -14.830951895 q = -14.830951895 Simplifying q = -14.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. q = {-3.169048105, -14.830951895}

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