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# Enlargement by a negative scale factor watch

1. sorry for asking so late at this hour but I can't seem to get myself round this topic, tried using mathswatch but I still don't understand what the lady is talking about so anyone who understands it , can you please explain it to me
Thanks.
2. (Original post by Naomeyz_01)
sorry for asking so late at this hour but I can't seem to get myself round this topic, tried using mathswatch but I still don't understand what the lady is talking about so anyone who understands it , can you please explain it to me
Thanks.
you're making it x times smaller? not quite sure though????
Zacken
3. (Original post by Naomeyz_01)
sorry for asking so late at this hour but I can't seem to get myself round this topic, tried using mathswatch but I still don't understand what the lady is talking about so anyone who understands it , can you please explain it to me
Thanks.
So when you make an enlargement of positive scale factor F from a point P, one way of doing it is to draw a line from P to a point X on the figure you are enlarging. You then extend the line to the new point Y so that PY = F x PX. You then repeat this for enough points of the figure to define the enlarged figure.

For a negative scale factor G, you extend the line the other way - in the opposite direction to the directed line PX. If the new point is Y' the length of PY' is |G| x PX.

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