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The polynomial f(x) has degree 3. If f(-1)=15, f(0)=0, f(1)=-7, and f(2)=0, then what are x-intercepts of the graph f?

 Dec 26, 2020
 #1
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I started with 

\(f(x)=ax^3+bx^2+cx+d\)

d is super easy to find

 

then I formed simultaneous equations  which will be used to find a,b and c

  You do this by substitution

 

and then solved them using matrices. 

 

Do what you can and get back to us - show us what you have done.

 Dec 27, 2020

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