### Home > INT3 > Chapter 8 > Lesson 8.2.2 > Problem8-81

8-81.
1. If f(x) = x2 + 7x – 9, calculate the values in parts (a) through (c) below. Homework Help ✎

1. f(–3)

2. f(i)

3. f(–3 + i)

f(−3) = −21

f(i) = i2 + 7i − 9

f(i) = −10 + 7i

$f(-3+ i)= (-3+i)^2+7(-3 + i) - 9$

Use an area model to expand (−3 + i)2.