CPM Homework Help : PC3 Problem 4-99

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4-99.

If $f(x)=x^2+7x$ , calculate:

$f(2)$
Step (a):
$f(2)=2^2+7(2)$

$f(-3)$
Step (b):
$f(−3)=(−3)^2+7(−3)$

$f(i)$
Step (c):
$f(i)=(i)^2+7(i)$
Remember, $i^2=−1$ .

$f(3.5+1.5i)$
Step (d):
$f(3.5+1.5i)\\=(3.5+1.5i)^2+7(3.5+1.5i)$

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