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OpenStudy (anonymous):
How many times does the graph of y=x^2-1 cross the x-axis? Answer 3 2 1 0
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jimthompson5910 (jim_thompson5910):
Do you have a graphing calculator?
OpenStudy (anonymous):
nope
jimthompson5910 (jim_thompson5910):
Alright, take a look at the graph at the link http://www.wolframalpha.com/input/?i=x^2-1
jimthompson5910 (jim_thompson5910):
How many times does that blue curve cross the horizontal axis?
OpenStudy (anonymous):
(x-1)*(x+1) factor it to see it crosses 2 times
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