5q^2-9q-3=0

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Solution for 5q^2-9q-3=0 equation:


Simplifying
5q2 + -9q + -3 = 0

Reorder the terms:
-3 + -9q + 5q2 = 0

Solving
-3 + -9q + 5q2 = 0

Solving for variable 'q'.

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

Divide each side by '5'.
-0.6 + -1.8q + q2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -1.8q + 0.6 + q2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -1.8q + q2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -1.8q + q2 = 0 + 0.6
-1.8q + q2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-1.8q + q2 = 0.6

The q term is -1.8q.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8q + 0.81 + q2 = 0.6 + 0.81

Reorder the terms:
0.81 + -1.8q + q2 = 0.6 + 0.81

Combine like terms: 0.6 + 0.81 = 1.41
0.81 + -1.8q + q2 = 1.41

Factor a perfect square on the left side:
(q + -0.9)(q + -0.9) = 1.41

Calculate the square root of the right side: 1.187434209

Break this problem into two subproblems by setting 
(q + -0.9) equal to 1.187434209 and -1.187434209.

Subproblem 1

q + -0.9 = 1.187434209 Simplifying q + -0.9 = 1.187434209 Reorder the terms: -0.9 + q = 1.187434209 Solving -0.9 + q = 1.187434209 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + q = 1.187434209 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + q = 1.187434209 + 0.9 q = 1.187434209 + 0.9 Combine like terms: 1.187434209 + 0.9 = 2.087434209 q = 2.087434209 Simplifying q = 2.087434209

Subproblem 2

q + -0.9 = -1.187434209 Simplifying q + -0.9 = -1.187434209 Reorder the terms: -0.9 + q = -1.187434209 Solving -0.9 + q = -1.187434209 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + q = -1.187434209 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + q = -1.187434209 + 0.9 q = -1.187434209 + 0.9 Combine like terms: -1.187434209 + 0.9 = -0.287434209 q = -0.287434209 Simplifying q = -0.287434209

Solution

The solution to the problem is based on the solutions from the subproblems. q = {2.087434209, -0.287434209}

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