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Let $f(x)=x^2-2x$. What is the value of $f(f(f(f(f(f(-1))))))$?

 Jul 24, 2021
 #1
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+1

You just keep substituting

 

f(-1)=1+2=3

f(f(-1))=f(3)=9-6=3

since f(3)=3 the answer is not going to change from here so the answer is 3

 Jul 24, 2021

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