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https://prnt.sc/oy853n

 Aug 27, 2019
 #1
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Note  that   at x = -1,  y = 0   so  x = -1  is a root

 

And note that when x = 0, y  =3    and when x = 1, y = -1....so....the graph must cross the x axis between x = 0 and x = 1.....so...we have another root  on this interval

 

Finally.....at x = 1, y =-1  and at x = 2, y =4   ...so.....the graph must again cross the  x axis ......so...we have another root

 

Lastly  at x = x, y= 4  and at x =3, y = -1...so....the graph crosses the x axis one last time...so....we have one more root

 

So.... since the function crosses the x axis 4 times....we have 4 roots...so....the degree is 4

 

We have  one negative zero   at x  = -1

 

And the other three roots are positive

 

 

cool cool cool 

 Aug 27, 2019

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