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hockeychick23

  • one year ago

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

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  1. madhu.mukherjee.946
    • one year ago
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    option D

  2. hockeychick23
    • one year ago
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    @dan815

  3. steve816
    • one year ago
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    Wrong, it's option c

  4. anonymous
    • one year ago
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    No, c is correct. You often see z = x+iy.

  5. steve816
    • one year ago
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    No, you use i to denote a complex number.

  6. steve816
    • one year ago
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    A, B, and D are correct, so what choices do we have left?

  7. anonymous
    • one year ago
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    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.

  8. anonymous
    • one year ago
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    @steve816 That's not right. "Denote" in this context means symbolize. 'i' doesn't denote a complex number, it *is* one.

  9. madhu.mukherjee.946
    • one year ago
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    its optionD

  10. anonymous
    • one year ago
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    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.

  11. anonymous
    • one year ago
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    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.

  12. zzr0ck3r
    • one year ago
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    \(B\) is the answer. All real numbers are complex, so that \(a+bi\) need not have \(b\ne 0\).

  13. IrishBoy123
    • one year ago
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    A is true so B must be untrue

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