Complex Numbers and Transformations (Leaving Cert Mathematics): Flashcards

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Complex Numbers and Transformations
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Scaling transformation of complex numbers

Multiply by a real number kk

Formula: ∣kz∣|kz| in terms of ∣z∣|z|

∣kz∣=k∣z∣|kz| = k|z|

Effect on modulus when k=2k=2

Modulus doubles

Effect on modulus when k=12k=\frac{1}{2}

Modulus halves

Translation transformation

Add same complex number to all points

What translation preserves

Shape and size, only position changes

Result of z×iz \times i

Rotates zz by 90° anticlockwise

Result of z×i2z \times i^2

Rotates zz by 180°

Result of z×i3z \times i^3

Rotates zz by 270° anticlockwise

Value of i2i^2

−1-1

Value of i3i^3

−i-i

Value of i4i^4

11

What scaling preserves

Direction from origin

How translation moves all points

Same distance in same direction

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