2q^2-3q-25=0

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Solution for 2q^2-3q-25=0 equation:


Simplifying
2q2 + -3q + -25 = 0

Reorder the terms:
-25 + -3q + 2q2 = 0

Solving
-25 + -3q + 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'.
-12.5 + -1.5q + q2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + -1.5q + 12.5 + q2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + -1.5q + q2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + -1.5q + q2 = 0 + 12.5
-1.5q + q2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
-1.5q + q2 = 12.5

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 = 12.5 + 0.5625

Reorder the terms:
0.5625 + -1.5q + q2 = 12.5 + 0.5625

Combine like terms: 12.5 + 0.5625 = 13.0625
0.5625 + -1.5q + q2 = 13.0625

Factor a perfect square on the left side:
(q + -0.75)(q + -0.75) = 13.0625

Calculate the square root of the right side: 3.614208074

Break this problem into two subproblems by setting 
(q + -0.75) equal to 3.614208074 and -3.614208074.

Subproblem 1

q + -0.75 = 3.614208074 Simplifying q + -0.75 = 3.614208074 Reorder the terms: -0.75 + q = 3.614208074 Solving -0.75 + q = 3.614208074 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 = 3.614208074 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + q = 3.614208074 + 0.75 q = 3.614208074 + 0.75 Combine like terms: 3.614208074 + 0.75 = 4.364208074 q = 4.364208074 Simplifying q = 4.364208074

Subproblem 2

q + -0.75 = -3.614208074 Simplifying q + -0.75 = -3.614208074 Reorder the terms: -0.75 + q = -3.614208074 Solving -0.75 + q = -3.614208074 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 = -3.614208074 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + q = -3.614208074 + 0.75 q = -3.614208074 + 0.75 Combine like terms: -3.614208074 + 0.75 = -2.864208074 q = -2.864208074 Simplifying q = -2.864208074

Solution

The solution to the problem is based on the solutions from the subproblems. q = {4.364208074, -2.864208074}

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