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Section 2.4
14, 18, 20
Question 14
4 + sqrt{-49}
4 + sqrt{49} • sqrt{-1}
4 + 7 • sqrt{-1}
Let sqrt{-1} = I
4 + 7i
Question 18
50 becomes 50 + 0i.
Question 20
-2i^2 + 4i
Let i^2 = -1
-2(-1) + 4i
2 + 4i
You say?
Can you do 22?
14, 18, 20
Question 14
4 + sqrt{-49}
4 + sqrt{49} • sqrt{-1}
4 + 7 • sqrt{-1}
Let sqrt{-1} = I
4 + 7i
Question 18
50 becomes 50 + 0i.
Question 20
-2i^2 + 4i
Let i^2 = -1
-2(-1) + 4i
2 + 4i
You say?
Can you do 22?