anonymous
  • anonymous
(x + 2) (x-9)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
=x^2-7x-18
anonymous
  • anonymous
is this equal to something?
anonymous
  • anonymous
or are you just told to multiply the facts to give an expression?

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anonymous
  • anonymous
multiply the facts to give an expression.
anonymous
  • anonymous
done
anonymous
  • anonymous
what does ^ mean?
anonymous
  • anonymous
raised to the power.
anonymous
  • anonymous
oh okay, thanks.
anonymous
  • anonymous
did you understand what Maph did there though?
anonymous
  • anonymous
9 x 2 = 18 but i'm not sure how Maph got the 7
anonymous
  • anonymous
remeber when doing a problem like that to use foil (first,outside,inside, last) then combine like terms to end up with the answer
anonymous
  • anonymous
thanks zbay.
anonymous
  • anonymous
okay, multiply the two terms and note that (a+b)*(c+d)= a(c+d) +b(c+d) = ac+ad+bc+bd so, (x+2)(x-9) = (x*x +2x-9x-18) = x^2-7x+18 (since 2x-9x = -7x)
anonymous
  • anonymous
whoops, that is -18 at the end there.

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