Advanced Algebra
posted by Aly .
I some problems that I need help with please.
Add or subtact as indicated and write the results in standard form.
4. 6(5+7i)(72i)
Divide and express the result in standard form. These problems I don't understand, do you have to multply the denominator by the numerator?
7. (63i)/(9+2i)
8. (33i)/ (53i)
Perform the indicated operations and write the result in standard form.
17. (4  square root of 36)^2 I got 20+48i
19. ( square root of 16)(square root of 4) This one I don't understand.
25. (42 + square root of 180)/6 this one I don't understand.
6(5+7i)(72i) =
6 + 5  7i  7 + 2i =
4  5 i
(63i)/(9+2i) =
(63i)(92i)/[(9+2i)(92i)]
(92i)(9+2i) = 81 + 4 = 85
(63i)(92i) = 54 6  12i  27i =
48  39 i
(4  square root of 36)^2 =
(4  6 i)^2 =
(4+6i)^2 =
16  36 + 48 i = 20 + 48 i
( square root of 16)(square root of 4) =
4 i * 2i = 8
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