+0  
 
0
29
2
avatar+82 

These problems are pretty hard to understand, for me at least.

 

Which statements are true about the polynomial function?

f(x)=x4+5x3−x2−5x

 

Select each correct answer.

 

Options

 

(x−5)  is a factor of  f(x) .

 

f(x)  divided by (x+5) has a remainder of 0.

 

f(5)=0

 

f(x)=0  when  x=−5 .

 

Please and thank you! 0^>

 
PhoenixForever  Nov 8, 2018
 #1
avatar+2758 
+1

The options can be translated into

 

i) 5 is zero of f(x)

 

ii) -5 is a zero of f(x)

 

iii) 5 is a zero of f(x)

 

iv) -5 is a zero of f(x)

 

I'd say the easiest method is just to plug both values in and see.

 

f(5) = 1200,

f(-5) = 0

 

so ii and iv are correct

 
Rom  Nov 8, 2018
 #2
avatar+82 
0

Thank you Rom!

 
PhoenixForever  Nov 9, 2018

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