C^2-9C+17=0

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Solution for C^2-9C+17=0 equation:


Simplifying
C2 + -9C + 17 = 0

Reorder the terms:
17 + -9C + C2 = 0

Solving
17 + -9C + C2 = 0

Solving for variable 'C'.

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + -9C + -17 + C2 = 0 + -17

Reorder the terms:
17 + -17 + -9C + C2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + -9C + C2 = 0 + -17
-9C + C2 = 0 + -17

Combine like terms: 0 + -17 = -17
-9C + C2 = -17

The C term is -9C.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9C + 20.25 + C2 = -17 + 20.25

Reorder the terms:
20.25 + -9C + C2 = -17 + 20.25

Combine like terms: -17 + 20.25 = 3.25
20.25 + -9C + C2 = 3.25

Factor a perfect square on the left side:
(C + -4.5)(C + -4.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(C + -4.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

C + -4.5 = 1.802775638 Simplifying C + -4.5 = 1.802775638 Reorder the terms: -4.5 + C = 1.802775638 Solving -4.5 + C = 1.802775638 Solving for variable 'C'. Move all terms containing C to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + C = 1.802775638 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + C = 1.802775638 + 4.5 C = 1.802775638 + 4.5 Combine like terms: 1.802775638 + 4.5 = 6.302775638 C = 6.302775638 Simplifying C = 6.302775638

Subproblem 2

C + -4.5 = -1.802775638 Simplifying C + -4.5 = -1.802775638 Reorder the terms: -4.5 + C = -1.802775638 Solving -4.5 + C = -1.802775638 Solving for variable 'C'. Move all terms containing C to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + C = -1.802775638 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + C = -1.802775638 + 4.5 C = -1.802775638 + 4.5 Combine like terms: -1.802775638 + 4.5 = 2.697224362 C = 2.697224362 Simplifying C = 2.697224362

Solution

The solution to the problem is based on the solutions from the subproblems. C = {6.302775638, 2.697224362}

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