find the mistake(a+b)^2= a^2+b^2^2 means squared

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter12: Sequences, Series And Binomial Theorem
Section12.4: Binomial Theorem
Problem 12.77TI: Find the coefficient of the x5 term of (x+4)8.
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find the mistake
(a+b)^2= a^2+b^2

^2 means squared

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