#### Answer

d., $(a+1)^{2}+1$

#### Work Step by Step

We are given that $f(x)=x^{2}+1$. To find $f(a+1)$, we can simply plug in $a+1$ into the given equation for x.
$f(a+1)=(a+1)^{2}+1$

Published by
Pearson

ISBN 10:
0321785045

ISBN 13:
978-0-32178-504-6

d., $(a+1)^{2}+1$

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