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# I dont do math :/

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point H is located at (-7,5) where is h after a 270 degree clockwise rotation

Feb 24, 2020

#1
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It will go from Quadrant 2      to  Quadrant 3   and will be   -5, -7

"I don't do math"   better learn 'to do'  math or  " I don't do math"  will never get far in this world. and I won't get much further if I make MISTAKES at math !!    Corrected my typo

Feb 24, 2020
edited by ElectricPavlov  Feb 24, 2020
#2
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A 270°  clockwise rotation   is the  same as  a  -90°  counter-clockwise  rotation

Let ( x, y)  be  the original   point  = ( -7, 5)

A 90°  counter-clockwise  rotation  gives  us  (-y, x)   =   (-5, -7)

Here's the  graph  :    Feb 24, 2020
#3
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point H is located at (-7,5) where is h after a 270 degree clockwise rotation

Let $$270^\circ$$ clockwise rotation = $$90^\circ$$ counter clockwise  rotation

$$\begin{array}{|lrcll|} \hline & && \text{complex} \\ \hline (-7,\ 5) \rightarrow & && ( -7+5i) \\ & && ( -7+5i)\times i & \times i ~(\text{ 90^\circ counter clockwise rotation}) \\ & &=&-7i+5i\times i \\ & &=&-7i+5i^2 \quad i^2 = -1 \\ & &=&-7i-5\\ (-5,\ -7) \leftarrow & &=&(-5-7i)\\ \hline \end{array}$$ Feb 25, 2020