q^2+6q-8=0

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Solution for q^2+6q-8=0 equation:


Simplifying
q2 + 6q + -8 = 0

Reorder the terms:
-8 + 6q + q2 = 0

Solving
-8 + 6q + q2 = 0

Solving for variable 'q'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 6q + 8 + q2 = 0 + 8

Reorder the terms:
-8 + 8 + 6q + q2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 6q + q2 = 0 + 8
6q + q2 = 0 + 8

Combine like terms: 0 + 8 = 8
6q + q2 = 8

The q term is 6q.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6q + 9 + q2 = 8 + 9

Reorder the terms:
9 + 6q + q2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + 6q + q2 = 17

Factor a perfect square on the left side:
(q + 3)(q + 3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(q + 3) equal to 4.123105626 and -4.123105626.

Subproblem 1

q + 3 = 4.123105626 Simplifying q + 3 = 4.123105626 Reorder the terms: 3 + q = 4.123105626 Solving 3 + q = 4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + q = 4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + q = 4.123105626 + -3 q = 4.123105626 + -3 Combine like terms: 4.123105626 + -3 = 1.123105626 q = 1.123105626 Simplifying q = 1.123105626

Subproblem 2

q + 3 = -4.123105626 Simplifying q + 3 = -4.123105626 Reorder the terms: 3 + q = -4.123105626 Solving 3 + q = -4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + q = -4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + q = -4.123105626 + -3 q = -4.123105626 + -3 Combine like terms: -4.123105626 + -3 = -7.123105626 q = -7.123105626 Simplifying q = -7.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. q = {1.123105626, -7.123105626}

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