(2q+1)(q-1)=18

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Solution for (2q+1)(q-1)=18 equation:


Simplifying
(2q + 1)(q + -1) = 18

Reorder the terms:
(1 + 2q)(q + -1) = 18

Reorder the terms:
(1 + 2q)(-1 + q) = 18

Multiply (1 + 2q) * (-1 + q)
(1(-1 + q) + 2q * (-1 + q)) = 18
((-1 * 1 + q * 1) + 2q * (-1 + q)) = 18
((-1 + 1q) + 2q * (-1 + q)) = 18
(-1 + 1q + (-1 * 2q + q * 2q)) = 18
(-1 + 1q + (-2q + 2q2)) = 18

Combine like terms: 1q + -2q = -1q
(-1 + -1q + 2q2) = 18

Solving
-1 + -1q + 2q2 = 18

Solving for variable 'q'.

Reorder the terms:
-1 + -18 + -1q + 2q2 = 18 + -18

Combine like terms: -1 + -18 = -19
-19 + -1q + 2q2 = 18 + -18

Combine like terms: 18 + -18 = 0
-19 + -1q + 2q2 = 0

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

Divide each side by '2'.
-9.5 + -0.5q + q2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -0.5q + 9.5 + q2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -0.5q + q2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -0.5q + q2 = 0 + 9.5
-0.5q + q2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-0.5q + q2 = 9.5

The q term is -0.5q.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5q + 0.0625 + q2 = 9.5 + 0.0625

Reorder the terms:
0.0625 + -0.5q + q2 = 9.5 + 0.0625

Combine like terms: 9.5 + 0.0625 = 9.5625
0.0625 + -0.5q + q2 = 9.5625

Factor a perfect square on the left side:
(q + -0.25)(q + -0.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(q + -0.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

q + -0.25 = 3.092329219 Simplifying q + -0.25 = 3.092329219 Reorder the terms: -0.25 + q = 3.092329219 Solving -0.25 + q = 3.092329219 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + q = 3.092329219 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + q = 3.092329219 + 0.25 q = 3.092329219 + 0.25 Combine like terms: 3.092329219 + 0.25 = 3.342329219 q = 3.342329219 Simplifying q = 3.342329219

Subproblem 2

q + -0.25 = -3.092329219 Simplifying q + -0.25 = -3.092329219 Reorder the terms: -0.25 + q = -3.092329219 Solving -0.25 + q = -3.092329219 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + q = -3.092329219 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + q = -3.092329219 + 0.25 q = -3.092329219 + 0.25 Combine like terms: -3.092329219 + 0.25 = -2.842329219 q = -2.842329219 Simplifying q = -2.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. q = {3.342329219, -2.842329219}

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