hockeychick23
  • hockeychick23
Which of the following statements is not true? A. Every real number is also a complex number B. In order for a+bi to be a complex number, b must be nonzero C. The variable z is often used to denote a complex number D. A complex number is a number that can be written in the form a+bi where a and b are real numbers
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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madhu.mukherjee.946
  • madhu.mukherjee.946
option D
hockeychick23
  • hockeychick23
@dan815
steve816
  • steve816
Wrong, it's option c

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More answers

anonymous
  • anonymous
No, c is correct. You often see z = x+iy.
steve816
  • steve816
No, you use i to denote a complex number.
steve816
  • steve816
A, B, and D are correct, so what choices do we have left?
anonymous
  • anonymous
The reals are a subset of the complex numbers, so every real number is also a complex number. I don't need i in order to have a complex number.
anonymous
  • anonymous
@steve816 That's not right. "Denote" in this context means symbolize. 'i' doesn't denote a complex number, it *is* one.
madhu.mukherjee.946
  • madhu.mukherjee.946
its optionD
anonymous
  • anonymous
Because the real numbers are a subset of the complex numbers, A is true. Even the number 3 can be considered a complex number. 3, for example, is simply a + bi where a = 3 and b = 0. Based on the argument above, if the real numbers are a subset of the complex numbers (as in every real number is also a complex number), then why would b need to be nonzero? I just gave an example where b = 0. z is most definitely used to represent a complex number. You will very often see f(z) = x + iy. Or a complex number \(z_{o} = x_{0} + iy_{0}\). This is common notation. D is correct as well. a +bi is the general form of a complex number. a and b are real numbers where a is the "real" part and b is the "imaginary" part. Theyre still real numbers in and of themselves, though.
anonymous
  • anonymous
Well, a more general form of a complex function would actually be something like : \(f(z) = u(x,y) + iv(x,y)\) Either way, z is definitely used, so C is fine.
zzr0ck3r
  • zzr0ck3r
\(B\) is the answer. All real numbers are complex, so that \(a+bi\) need not have \(b\ne 0\).
IrishBoy123
  • IrishBoy123
A is true so B must be untrue

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