[Laalalala]

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They take out a factor of root 5, how on earth would I know to do that?!

[Umairy363]

(Original post by Laalalala)
|1 -2|
|2 1|


They take out a factor of root 5, how on earth would I know to do that?!

To find that, i would take the determinant of that Matrix, which is 5.

This shows the Area Scale factor, so the enlargement scale factor would be root 5.

So there is an enlargement of SF Root 5 and hence you can work out the rest.

(This is assuming that you know about determinants)