# Help with imaginary numbers?

I need help with imaginary numbers like with "i". I know i=sqr-1...but how do I do problems like:

1) 1/2+5i ?

I'm supposed to simplify it. How do I find out what 5i is?

2) 3+ isqr2/ 7-isqr2 ?

please help

1) 1/2+5i ?

I'm supposed to simplify it. How do I find out what 5i is?

2) 3+ isqr2/ 7-isqr2 ?

please help

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