2q^2-8=3q

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Solution for 2q^2-8=3q equation:


Simplifying
2q2 + -8 = 3q

Reorder the terms:
-8 + 2q2 = 3q

Solving
-8 + 2q2 = 3q

Solving for variable 'q'.

Reorder the terms:
-8 + -3q + 2q2 = 3q + -3q

Combine like terms: 3q + -3q = 0
-8 + -3q + 2q2 = 0

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

Divide each side by '2'.
-4 + -1.5q + q2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -1.5q + 4 + q2 = 0 + 4

Reorder the terms:
-4 + 4 + -1.5q + q2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1.5q + q2 = 0 + 4
-1.5q + q2 = 0 + 4

Combine like terms: 0 + 4 = 4
-1.5q + q2 = 4

The q term is -1.5q.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5q + 0.5625 + q2 = 4 + 0.5625

Reorder the terms:
0.5625 + -1.5q + q2 = 4 + 0.5625

Combine like terms: 4 + 0.5625 = 4.5625
0.5625 + -1.5q + q2 = 4.5625

Factor a perfect square on the left side:
(q + -0.75)(q + -0.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(q + -0.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

q + -0.75 = 2.136000936 Simplifying q + -0.75 = 2.136000936 Reorder the terms: -0.75 + q = 2.136000936 Solving -0.75 + q = 2.136000936 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + q = 2.136000936 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + q = 2.136000936 + 0.75 q = 2.136000936 + 0.75 Combine like terms: 2.136000936 + 0.75 = 2.886000936 q = 2.886000936 Simplifying q = 2.886000936

Subproblem 2

q + -0.75 = -2.136000936 Simplifying q + -0.75 = -2.136000936 Reorder the terms: -0.75 + q = -2.136000936 Solving -0.75 + q = -2.136000936 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + q = -2.136000936 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + q = -2.136000936 + 0.75 q = -2.136000936 + 0.75 Combine like terms: -2.136000936 + 0.75 = -1.386000936 q = -1.386000936 Simplifying q = -1.386000936

Solution

The solution to the problem is based on the solutions from the subproblems. q = {2.886000936, -1.386000936}

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