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Mathematics 7 Online
OpenStudy (anonymous):

How many times does the graph of y=x^2-1 cross the x-axis? Answer 3 2 1 0

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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