Also:
Solve the equation:
m^2=25
2006-07-26 10:33:38 · 4 answers · asked by Brandon ツ 3 in Science & Mathematics ➔ Mathematics
Quickmath.com got (-5,5)
2006-07-26 10:34:09 · update #1
...for the 2nd problem
2006-07-26 10:34:25 · update #2
6/(7 + 2i) ::: multiply with conjugate of the denominator
[6*(7-2i)] / [(7 + 2i)*(7 - 2i)]
... = [42 - 12i] / [49 + 4]
... = 42/53 - 12/53 i
and for the second problem --- Quickmath was right
2006-07-26 10:40:03 · answer #1 · answered by dutch_prof 4 · 1⤊ 1⤋
Yes m=plus or minus 5 for the second problem.
For the first one, multiply the top and the bottom with the conjugate 7-21 and you get 6(7-2i)/53 and leave it as that because you can't reduce it further.
2006-07-26 10:39:19 · answer #2 · answered by The Prince 6 · 0⤊ 0⤋
6 / 7 + 2i
multiply by conjugate of 7 + 2i that is 7 - 2i
thus we get, 6 (7-2i) / (7+2i)(7-2i)
42 - 12i / (49 - 4 i ^2)
42 - 12i / 53
that is 42/53 - 12i/53
second question..
m = +5 ,- 5
2006-07-27 00:07:34 · answer #3 · answered by yrzfuly 3 · 0⤊ 0⤋
6/(7 + 2i)
(6(7 - 2i))/((7 + 2i)(7 - 2i))
(6(7 - 2i))/(49 - 4i^2)
(6(7 - 2i))/(49 - 4(-1))
(6(7 - 2i))/(49 + 5)
(6(7 - 2i))/(54)
(7 - 2i)/9
-------------------------------------
m^2 = 25
m = 5 or -5
2006-07-26 13:31:40 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋