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2020 Mathematics Extension 2 Q11 (a) (i) | Atlas

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2020HSCShort answer

Q11 (a) (i)

1 mark

Question

Consider the complex numbers $w=-1+4i$ and $z=2-i$ . Evaluate $|w|$ .

Try the question before revealing the answer.

Solution

Marks: Provides correct answer
Sample answer:
$w=-1+4i$
$|w|$ = $\sqrt{17}$

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Complex Numbers

Geometric representation of a complex numberRepresent complex numbers in the complex plane and use modulus, argument and polar form with their identities.

Source

2020 HSC Mathematics Extension 2 Test 2NESAQuestion paper page 6Guidance page 2

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