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#1**+1 **

We can use this formula to find each new point

new point = (old point - center)*scale factor + center

So

[ (-1, 3) - ( -2 , -2) ] * 2 + (-2, -2) = [ 1 , 5 ] *2 + (-2,-2) = (2, 10) + (-2, -2) = (0, 8)

[ (-5, 2) - ( -2, -2) ] *2 + (-2, -2) = [ -3, , 4]*2 + (-2,-2) = ( -6, 8 ) + (-2, -2) = (-8, 6)

[(-4, -2) - (-2, -2) ] *2 + (-2, -2) = [ (-2, 0) ]*2 + (-2, -2) = (-4, 0) + (-2, -2) = (-6, -2)

[ (1,1) - (-2, -2)]*2 + (-2,-2) = [ (3, 3]*2 + (-2, -2) = (6, 6) + (-2, -2) = (4, 4)

Here's a pic :

CPhill Oct 18, 2018