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simplify radicals

simplify:
 
1.  √-25√-9
 
2.  (6i)^2
 
3.  1/i
 
4.  -√3(√-3)
 
5.  1/2 - i
 
thanks

Comments

Place your parenthesis. The way you have written number 5 is just a complex Number.

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
0
1.
    5i . 3i = -15
 
 2 .  -36
 
 3 .   -i
 
4 .  - 3i
 
5.  1/ ( 2 - i) =  ( 2 - i )  / ( 2 +i ) ( 2 -i) = 1/3( 2- i ) = 1/6 -1/3i
Steve S. | Tutoring in Precalculus, Trig, and Differential CalculusTutoring in Precalculus, Trig, and Diffe...
5.0 5.0 (3 lesson ratings) (3)
0
1. √(-25)√(-9) = (5i)(3i) = –15

2. (6i)^2 = (6i)(6i) = –36

3. 1/i = i/i^2 = –i

4. – √(3)√(-3) = – √(3) i√(3) = –3i

5. 1/(2–i) = (2+i)/((2+i)(2–i)) = (2+i)/5 = 2/5 + 1/5 i