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Question 269712: a is real. 1+a+a2+a3=40 what is a?
Answer by vleith(2983)   (Show Source):
You can put this solution on YOUR website! You can get all wrapped up in the math on this one. But given the info provided, trial and error is a good way to go.
Try setting a=1 and seeing if it works
Try a=2
then a=3
Basically, get in the ball park and take it from there
Look at this for other variants and a plot
http://www.wolframalpha.com/input/?i=1%2Ba%2Ba^2%2Ba^3%3D40
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