SOLUTION: The roots of the equation are 2 + 9i and 2 – 9i. What is the value of c? x2 – 4x + c = 0 c=___________

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Question 932181: The roots of the equation are 2 + 9i and 2 – 9i.
What is the value of c?
x2 – 4x + c = 0
c=___________
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
The roots of the equation are %282+%2B+9i%29 and %282-9i%29.
the equation will be:
%28x-%282+%2B+9i%29%29%28x-%282+-9i%29%29=0
%28x-2-9i%29%28x-2%2B9i%29=0
x%5E2-2x%2B9i%2Ax-2x%2B4-18i%2B18i%2Ax-9i%2A9i=0
x%5E2-4x%2B4-81%28-1%29=0
x%5E2-4x%2B4%2B81=0
x%5E2-4x%2B85=0

What is the value of c?
so, c=85