c^2-15c-96=0

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Solution for c^2-15c-96=0 equation:


Simplifying
c2 + -15c + -96 = 0

Reorder the terms:
-96 + -15c + c2 = 0

Solving
-96 + -15c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '96' to each side of the equation.
-96 + -15c + 96 + c2 = 0 + 96

Reorder the terms:
-96 + 96 + -15c + c2 = 0 + 96

Combine like terms: -96 + 96 = 0
0 + -15c + c2 = 0 + 96
-15c + c2 = 0 + 96

Combine like terms: 0 + 96 = 96
-15c + c2 = 96

The c term is -15c.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15c + 56.25 + c2 = 96 + 56.25

Reorder the terms:
56.25 + -15c + c2 = 96 + 56.25

Combine like terms: 96 + 56.25 = 152.25
56.25 + -15c + c2 = 152.25

Factor a perfect square on the left side:
(c + -7.5)(c + -7.5) = 152.25

Calculate the square root of the right side: 12.338962679

Break this problem into two subproblems by setting 
(c + -7.5) equal to 12.338962679 and -12.338962679.

Subproblem 1

c + -7.5 = 12.338962679 Simplifying c + -7.5 = 12.338962679 Reorder the terms: -7.5 + c = 12.338962679 Solving -7.5 + c = 12.338962679 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + c = 12.338962679 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + c = 12.338962679 + 7.5 c = 12.338962679 + 7.5 Combine like terms: 12.338962679 + 7.5 = 19.838962679 c = 19.838962679 Simplifying c = 19.838962679

Subproblem 2

c + -7.5 = -12.338962679 Simplifying c + -7.5 = -12.338962679 Reorder the terms: -7.5 + c = -12.338962679 Solving -7.5 + c = -12.338962679 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + c = -12.338962679 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + c = -12.338962679 + 7.5 c = -12.338962679 + 7.5 Combine like terms: -12.338962679 + 7.5 = -4.838962679 c = -4.838962679 Simplifying c = -4.838962679

Solution

The solution to the problem is based on the solutions from the subproblems. c = {19.838962679, -4.838962679}

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