SOLUTION: Use z = a + bi to show that z double bars = z. Note: z double bars means there are two bar lines above the letter z.

Question 1207459: Use z = a + bi to show that z double bars = z.

Note: z double bars means there are two bar lines above the letter z.
Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
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First bar changes the sign of the term bi to opposite,

transforming  a+bi  to  a-bi.



Second bar changes the sign of the term (-bi) to opposite,

transforming  a-bi  to a - (-bi) = a+bi.



Thus doubled bar returns  a+bi  to its original form.

Solved and explained, in full and completely.

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