+0  
 
+5
393
1
avatar

The polynomial function​ f(x) has the given zero. Find the other zeros.

F(x)=x^3+7x^2-3x-21;-7

Guest Feb 26, 2017
 #1
avatar+87303 
0

x^3+7x^2-3x-21;  -7   is a zero

 

Factor  by grouping

 

x^2 ( x + 7) - 3(x + 7)  =  0

 

(x + 7)  ( x ^2  - 3 )  = 0

 

We   know  the  zero  of the first factor.....to find the zeroes of the second, we have

 

x^2  - 3   = 0     add 3 to both sides

 

x^2  =  3         take  both positive and negative roots

 

x =  ± √3

 

 

cool cool cool

CPhill  Feb 26, 2017

11 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.