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11 years ago
Evaluate the expression and write the result in the form a + bi.
(2/3 + 12i)(1/2 + 25i)

Evaluate the expression and write the result in the form a + bi.
1/(2-5i) - 1/(6+6i)

thanks, any answer will be given points, you don't have to answer both,
but if you see to many people answering 1, then go for the other
and if you answer both of them correctly you get the 10 points
thanks for all your aswers but I'm still getting them wrong
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ilibeeilibee
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#1
11 years ago
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#2
11 years ago
i will do the first one only .. which can help you in solving the second one ..if you want to

(2/3 + 12i)(1/2 + 25i)

start by expanding the bracket

2/3 * 1/2 + 2/3 *25 i + 12i * 1/2 + 12 i * 25 i

= 3 + 50/3 i + 6i + 300 i^2

we know i^2 = -1 so putting the value

= 3 + 68/3 i -300

= 68/3 i - 297
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#3
11 years ago
(2/3 + 12i)(1/2 + 25i) = 2/6+ 50/3i+6i+300i^2= 1/3+22 2/3 i+ 300i^2

1/(2-5i) - 1/(6+6i)= (6+6i- 2+5i)/ (2-5i)(6+6i)= (4+11i)/(12-18i-30i^2)
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