+0  
 
+1
79
4
avatar+176 

Expand \((x+1)(x^{2}+1)(x-1)\). What is the sum of the coefficients of the resulting expression?

 Jul 6, 2020
 #1
avatar+30920 
+2

The sum of the coefficients of a polynomial is just given by the sum of all the terms when x = 1.  So to find it just set x = 1 in your expression.

 Jul 6, 2020
edited by Alan  Jul 6, 2020
 #2
avatar+176 
+2

so is it 0?

BillyBobJoeJr  Jul 6, 2020
 #3
avatar+30920 
+1

Correct.

Alan  Jul 6, 2020
 #4
avatar+176 
+2

thx for your help!

BillyBobJoeJr  Jul 6, 2020

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