0=q^2+25q-100

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Solution for 0=q^2+25q-100 equation:


Simplifying
0 = q2 + 25q + -100

Reorder the terms:
0 = -100 + 25q + q2

Solving
0 = -100 + 25q + q2

Solving for variable 'q'.

Combine like terms: 0 + 100 = 100
100 + -25q + -1q2 = -100 + 25q + q2 + 100 + -25q + -1q2

Reorder the terms:
100 + -25q + -1q2 = -100 + 100 + 25q + -25q + q2 + -1q2

Combine like terms: -100 + 100 = 0
100 + -25q + -1q2 = 0 + 25q + -25q + q2 + -1q2
100 + -25q + -1q2 = 25q + -25q + q2 + -1q2

Combine like terms: 25q + -25q = 0
100 + -25q + -1q2 = 0 + q2 + -1q2
100 + -25q + -1q2 = q2 + -1q2

Combine like terms: q2 + -1q2 = 0
100 + -25q + -1q2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-100 + 25q + q2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 25q + 100 + q2 = 0 + 100

Reorder the terms:
-100 + 100 + 25q + q2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 25q + q2 = 0 + 100
25q + q2 = 0 + 100

Combine like terms: 0 + 100 = 100
25q + q2 = 100

The q term is 25q.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25q + 156.25 + q2 = 100 + 156.25

Reorder the terms:
156.25 + 25q + q2 = 100 + 156.25

Combine like terms: 100 + 156.25 = 256.25
156.25 + 25q + q2 = 256.25

Factor a perfect square on the left side:
(q + 12.5)(q + 12.5) = 256.25

Calculate the square root of the right side: 16.007810594

Break this problem into two subproblems by setting 
(q + 12.5) equal to 16.007810594 and -16.007810594.

Subproblem 1

q + 12.5 = 16.007810594 Simplifying q + 12.5 = 16.007810594 Reorder the terms: 12.5 + q = 16.007810594 Solving 12.5 + q = 16.007810594 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + q = 16.007810594 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + q = 16.007810594 + -12.5 q = 16.007810594 + -12.5 Combine like terms: 16.007810594 + -12.5 = 3.507810594 q = 3.507810594 Simplifying q = 3.507810594

Subproblem 2

q + 12.5 = -16.007810594 Simplifying q + 12.5 = -16.007810594 Reorder the terms: 12.5 + q = -16.007810594 Solving 12.5 + q = -16.007810594 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + q = -16.007810594 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + q = -16.007810594 + -12.5 q = -16.007810594 + -12.5 Combine like terms: -16.007810594 + -12.5 = -28.507810594 q = -28.507810594 Simplifying q = -28.507810594

Solution

The solution to the problem is based on the solutions from the subproblems. q = {3.507810594, -28.507810594}

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