anonymous
  • anonymous
Factor the expression 49x^2 -42xy+9y^2 into a product of binomials. So far I have (7x-9y)(7x-9y) I think the 9y is wrong but I do not know what to change it to then? Help?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
That's a perfect square trinomial, and it factors to\[(7x - 3y)^{2}.\]
anonymous
  • anonymous
I was just thinking maybe that last part is -3y. How would I show my work on this? Do I check it by doing FOIL?
anonymous
  • anonymous
Yes, you can check by the FOIL method.

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anonymous
  • anonymous
Ok Thank you for your help!
anonymous
  • anonymous
:^)

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