anonymous
  • anonymous
Can someone tell me if this answer is correct or not?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
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anonymous
  • anonymous
What are the factors of x2 - 81? I put prime
nikato
  • nikato
IM BACK! haha and no, its not prime.
nikato
  • nikato
its a special kind called difference of square. see how 81 is a perfect square because 9^2=81

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anonymous
  • anonymous
Ah, okay, so would the answer be (x-9) (x-9) then?
nikato
  • nikato
(x-9)(x+9) remember with difference of squares theres is one - and the other is +
nikato
  • nikato
and you can check. (x-9)(x-9)= x^2 -18x+81
anonymous
  • anonymous
I did (x-9)(x+9) and that didn't work for me. Are you sure? I got x^2-9x+9x-81 After this point I had to either add the -9 to itself and positive 9 or the other way around which wouldn't equal x^2=-81
Pawanyadav
  • Pawanyadav
x^2-y^2= (x+y)(x-y) always. In your question y=9.
anonymous
  • anonymous
Wait so do you always have to cross out the two x that isn't squared or cubed?
nikato
  • nikato
ys. because they cancel each other. they add up to 0
nikato
  • nikato
well, only in this problem
anonymous
  • anonymous
Ooooh, okay. That makes allot more sense now. Haha, thanks for telling me.

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