anonymous
  • anonymous
Equation in the response
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
\[(2+3\sqrt{10})(4-5\sqrt{5})\]
anonymous
  • anonymous
Foil it out.
anonymous
  • anonymous
how do i dow the sqrt 10 and sqrt 5 with foil?

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anonymous
  • anonymous
Multiply them.
anonymous
  • anonymous
\[3\sqrt{10} \times -5\sqrt{5} = (3 \times -5)(\sqrt{10}\times\sqrt{5})\]
anonymous
  • anonymous
\[=-15 \sqrt{50} = -15(5\sqrt{2}) = -75\sqrt{2}\]
anonymous
  • anonymous
Then just add that along with your other terms.
anonymous
  • anonymous
so its \[-75\sqrt{2}\]
anonymous
  • anonymous
Well, that's the result of \[3\sqrt{10} \times -5\sqrt{5}\]
anonymous
  • anonymous
You still need to foil the rest of your terms.
anonymous
  • anonymous
foiled i got \[8\sqrt{100}\]
radar
  • radar
You have a problem whose solution ain't gonna be pretty!
anonymous
  • anonymous
wait what is the answer?
radar
  • radar
Well you got one of the terms, just continue your multiplication, next multiply the \[-5\sqrt{5}\times 2\]
radar
  • radar
Your answer will have 4 terms, one is the\[-75\sqrt{2}\]which polpak and you worked out, now work the one above and you will be half way there!
radar
  • radar
A loss is a gain without effort.

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