Question

16. Use the distributive property to simplify the expression 4(8+ 2i).

A: 12 + 2i
B: 32 + 8i
C: 12 + 8i
D: 40i

17. Use the distributive property to simplify the expression 4i(5 – 7i)

A: 28 - 20i
B: 28 + 20i
C: 9i – 28i2
9i– 3i2

Answer 1

Problem 16

4(8+2i)

4*8 + 4*2i

32+8i

Answer: Choice B

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Problem 17

4i(5-7i)

4i*5 + 4i*(-7i)

20i - 28i^2

20i - 28(-1) .... recall that i^2 = -1

20i + 28

28 + 20i

Answer: Choice B