Homework Help: please help with geometry - dilation

Posted by Knights on Thursday, February 21, 2013 at 5:37pm.

When a square of area 4 is dilated by a scale factor of k, we obtain a square of area 9. Find the sum of all possible values of k.

I do not understand...it is not 3/2, as I was told, but I don't understand why? Help?

please help with geometry - dilation - JJ, Thursday, February 21, 2013 at 5:51pm
A square with an area of 4 has to have all sides equal to 2. Right?

If I increase by a factor of k that means multiply 2 times k

My area is 2k times 2k = 4k^2

I would set this equal to 9

I am getting 3/2 for the value of k

-3/2 is another possibility, but we have to discount it because we don't measure distance as negative numbers.

I agree with your 3/2, but I wonder if someone else summed -3/2 and 3/2 = 0
please help with geometry - dilation - Knights, Thursday, February 21, 2013 at 5:53pm
thanks a lot i appreciate your time

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