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lvl10720-Turquoise
20-Turquoise
June 21, 2014
Question

[ e^(-1i*a*x) ]^(1i / a*x) - e = 0 , substitute,a=2, solve,x . How many solutions ?

  • June 21, 2014
  • 2 replies
  • 1047 views

Hello,

How many solutions .PNG

Thanks in advance.

2 replies

L
LucMeekes23-Emerald IV
23-Emerald IV
June 21, 2014

The answer should be:infinite

(e^B)^C=e^(B*C)

in your case B=-iax and C=i/(ax), so B*C=1

That simplifies your equation to e-e=0

any value of x will do, as long as it's unqual to 0.

Success!

Luc

Werner_E
Werner_E25-Diamond I
25-Diamond I
June 22, 2014

(e^B)^C=e^(B*C)

As we are obviously dealing with complex numbers, thats only true if C is an integer! Otherwise any complex number with magnitude e^(B*C) and argument any integer multiple of C*2*pi is result. If C is irrational thats even an infinte number of results.

But as the question is about solving that equation, your solution is valid nonetheless: if a is unequal to zero, x can be any value different from zero, otherwise x is undefined.

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