Title: Evaluate the expression can solve? Post by: #8 on Oct 20, 2012 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 Title: Evaluate the expression can solve? Post by: ilibee on Oct 20, 2012 Content hidden
Title: Evaluate the expression can solve? Post by: tomtom1234 on Oct 20, 2012 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 Title: Evaluate the expression can solve? Post by: Tonbon1221 on Oct 20, 2012 (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) |