Change of signWatch

#1
How many times does the function

change sign on the negative x-axis?

Do I just factorise both num/dom and then count when x is negative?
0
9 years ago
#2
(Original post by MrEff)
How many times does the function

change sign on the negative x-axis?

Do I just factorise both num/dom and then count when x is negative?
pretty much

so since for all x you need only consider the denominator, when you said "negative x" i assumed you meant only considering when so im getting:

when -1 < x < 0 f(x) is +ve

when -9 < x < -1 f(x) is -ve

when -∞ < x < -9 f(x) is +ve

so twice imo
0
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