2 years ago

Subtract the complex numbers: (-2 + 12i) - (-1 - 9i)

Mathematics

2 answers:

jasenka [17]2 years ago

8 0

Answer:

B. -3 + 3i

Step-by-step explanation:

Using the foil method:

-2 - 1 = -3

12i - 9i = 3i

= -3 + 3i

Andrew [12]2 years ago

3 0

9514 1404 393

Answer:

C) -1 +21i

Step-by-step explanation:

For many purposes, "i" can be treated as though it is a variable. Collect terms in the usual way.

(-2 +12i) -(-1 -9i) . . . . given

= -2 +12i +1 +9i . . . . use the distributive property to eliminate parentheses

= (-2+1) +(12i +9i) . . . group like terms

= -1 +21i

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