Question

Please help me! I'm taking a test that closes in 10 minutes!

1) Simplify √-49 using the imaginary unit i.
2) Simplify √-20 using the imaginary unit i.
3) Simplify the expression. Write it in standard form. (-3 + 2i) + (2 + i)
4) Simplify the expression. Write it in standard form. (9 +4i)²
5) Simplify the expression. Write it in standard form. (5i √-32) (i √-27)

Answer 1

Answers:

1)
`7i`

2)
`2i√(5)`

3)
`-1+3i`

4)
`65+72i`

5)
`60√(6)`

Hope this helps! :)