Asked by Cynthia
(x+19)(x-7)(x+17)>0=-19<x<-17 or x>7
Can someone please look at this equation and let me know if I did it correctly.
Can someone please look at this equation and let me know if I did it correctly.
Answers
Answered by
drwls
If x>7, all factors are positive and the product is positive. So that is OK
If -19<x<-17, two factors are negative and x+19 is positive, so the product is positive. Also OK
There are no other regions where the function is positive. It is a cubic equation with three roots. Between the secoind and third roots, it is negative.
If -19<x<-17, two factors are negative and x+19 is positive, so the product is positive. Also OK
There are no other regions where the function is positive. It is a cubic equation with three roots. Between the secoind and third roots, it is negative.
Answered by
Cynthia
Thank you
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