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College Algebra & Trigonometry, 2018a

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1.4. COMPLEX NUMBERS 45<br />

Express each quantity in terms of i. Round irrational values to the nearest 1000th.<br />

13)<br />

√ −36 14)<br />

√ −81 15)<br />

√ −100 16)<br />

√ −49<br />

17)<br />

√ −4 18)<br />

√ −25 19)<br />

√ −2 20)<br />

√ −6<br />

21)<br />

√ −10 22)<br />

√ −31 23)<br />

√ −5 24)<br />

√ −3<br />

Perform the indicated operation and simplify.<br />

25) (6+7i)+(5+3i) 26) (4 − 5i)+(3+9i)<br />

27) (9+8i) − (1 − 2i) 28) (2 + i) − (6 − 4i)<br />

29) (7 − 4i) − (5 − 3i) 30) (8 + i) − (4+3i)<br />

31) (7i)(6i) 32) (4i)(−8i)<br />

33) (−2i)(5i) 34) (12i)(3i)<br />

35) (1 + i)(3+2i) 36) (1+5i)(4+3i)<br />

37) (6 − 5i)(2 − 3i) 38) (8 − 3i)(2 + i)<br />

39) (−3+4i)(−1 − 2i) 40) (−7 − i)(3 − 5i)<br />

41) (4 − 2i) 2 42) (−5+i) 2

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