Posted by **Cyleste** on Wednesday, October 10, 2007 at 6:01pm.

what is a perfect square number i know 9, 25 and 100, but what else

if you multiply a perfect square by a perfect square, is the answer always a perfect square

- Algebra -
**Quidditch**, Wednesday, October 10, 2007 at 9:06pm
Yes, this might be easier to understand if you think of expressing the perfect square as a product of its square roots. Rearrange to see that the product is a perfect square

if x and y are perfect squares:

x = a * a

y = b * b

x * y = a * a * b * b

x * y = (a * b) * (a * b)

let c = a * b

x * y = c * c

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