Posted by Alli on Sunday, September 4, 2011 at 3:37pm.
x^13 = j Divide both sides with x
x^13 / x = j / x
( Remark: x^13 / x = x^12 )
x^12 = j / x
x^12 = 4 / 9
j / x = 4 / 9 Multiply both sides with 9
9 j / x = 4 Multiply both sides with x
9 j = 4x Divide both sides with 4
9 j / 4 = x
x = 9 j / 4
x = ( 9 / 4 ) j
x^12 * x=x^13
4/9 * x=j
divide both sides by 4/9
x= 9j/4
This is a very poor question, as the letter j is very often used as the square root on -1, and because of that, it should never be used as a variable.
The same thing applies for i, another symbol for sqrt-1.
Why are i and j both used as symbols for sqrt -1? Because in writing i, it is often confused for 1. See http://en.wikipedia.org/wiki/Imaginary_unit
whts the answer
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