Knock out the true statements

Exercise and reference answers

Questions

1. Question

   Eliminate the true statements about complex numbers.

   Choices

   1. Item

      The modulus may come out negative

      Correct

      Yes

   2. Explanation

      The conjugate of a plus ib is a minus ib.

      Item

      The conjugate changes the sign of b

   3. Explanation

      The x-axis is the real axis and the y-axis the imaginary one.

      Item

      The Argand plane has two named axes

   4. Explanation

      For any two complex numbers the sum is the same either way round.

      Item

      Complex addition is commutative

Instructions

Remove the statements that are true. One false one should survive.

Explanation