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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

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