Simplify the number using the imaginary unit i. (sqrt)of -28

Question

•2(sqrt)-7
•-2 (sqrt)-7
•i (sqrt)28
•2i (sqrt)7

Answer 1

sqrt ( - 28 ) =

sqrt ( - 4 * 7 ) =

sqrt ( - 1 * 4 * 7 ) =

sqrt ( - 1 ) * sqrt ( 4 ) * sqrt ( 7 ) =

i * 2 * sqrt ( 7 ) =

2 i sqrt ( 7 )

Answer 2

1. D. 2i sqrt 7
2. B. 4, 2
3. B. 11-2i
4. C. 20-4i
5. A. 31+i/26
6. C. 1 i sqrt 9

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