2q^2+17q+5=0

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Solution for 2q^2+17q+5=0 equation:


Simplifying
2q2 + 17q + 5 = 0

Reorder the terms:
5 + 17q + 2q2 = 0

Solving
5 + 17q + 2q2 = 0

Solving for variable 'q'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
2.5 + 8.5q + q2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + 8.5q + -2.5 + q2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + 8.5q + q2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + 8.5q + q2 = 0 + -2.5
8.5q + q2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
8.5q + q2 = -2.5

The q term is 8.5q.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5q + 18.0625 + q2 = -2.5 + 18.0625

Reorder the terms:
18.0625 + 8.5q + q2 = -2.5 + 18.0625

Combine like terms: -2.5 + 18.0625 = 15.5625
18.0625 + 8.5q + q2 = 15.5625

Factor a perfect square on the left side:
(q + 4.25)(q + 4.25) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(q + 4.25) equal to 3.94493346 and -3.94493346.

Subproblem 1

q + 4.25 = 3.94493346 Simplifying q + 4.25 = 3.94493346 Reorder the terms: 4.25 + q = 3.94493346 Solving 4.25 + q = 3.94493346 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + q = 3.94493346 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + q = 3.94493346 + -4.25 q = 3.94493346 + -4.25 Combine like terms: 3.94493346 + -4.25 = -0.30506654 q = -0.30506654 Simplifying q = -0.30506654

Subproblem 2

q + 4.25 = -3.94493346 Simplifying q + 4.25 = -3.94493346 Reorder the terms: 4.25 + q = -3.94493346 Solving 4.25 + q = -3.94493346 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + q = -3.94493346 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + q = -3.94493346 + -4.25 q = -3.94493346 + -4.25 Combine like terms: -3.94493346 + -4.25 = -8.19493346 q = -8.19493346 Simplifying q = -8.19493346

Solution

The solution to the problem is based on the solutions from the subproblems. q = {-0.30506654, -8.19493346}

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