Why is it that (k+1)^4 became (k+1)^3

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter8: Polynomials
Section8.5: Using The Distributive Property
Problem 57PFA
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Why is it that (k+1)^4 became (k+1)^3? 

کے
K(K+1) (2K+1) (3K²+3K-1) +30 (K+1)
30
(K+1) [K(²K+1) (3ײ+3K-1) + 30 (K+1)³]
30
Transcribed Image Text:کے K(K+1) (2K+1) (3K²+3K-1) +30 (K+1) 30 (K+1) [K(²K+1) (3ײ+3K-1) + 30 (K+1)³] 30
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