SOLUTION: What is the average of the 2 solutions for the general equation ax^+b+c=0 How can this be useful when checking answers?

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Question 237504: What is the average of the 2 solutions for the general equation ax^+b+c=0
How can this be useful when checking answers?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
To find the average, add the two solutions and divide the sum by 2.
x%5B1%5D+=+%28%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F2a%29
x%5B2%5D+=+%28-b-sqrt%28b%5E2-4ac%29%29%2F2a Add these two solutions:
=2%28-b%29%2F2a=%28-b%29%2Fa Now divide by 2 to get the average:
%28-b%2Fa%29%2F2+=+highlight%28%28-b%29%2F%282a%29%29