SOLUTION: Can you help me find the answer to c^2 + c - 20 ?

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Question 7086: Can you help me find the answer to c^2 + c - 20 ?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve: c%5E2+%2B+c+-+20 ?
This is an expression and you can't solve expressions but you could solve this if it were an equation such as:
c%5E2+%2B+c+-+20+=+0
Let's assume that this is what you meant to write.
c%5E2+%2B+c+-+20+=+0 Solve by factoring.
%28c+%2B+5%29%28c+-+4%29+=+0 Apply the zero product principle by setting (c+5) = 0 and (c-4) = 0.
If %28c+%2B+5%29+=+0, then c+=+-5
If %28c+-+4%29+=+0, then c+=+4
The roots of this quadratic equation are: x = -5 or x = 4