## anonymous 5 years ago Equation in the response

1. anonymous

$(2+3\sqrt{10})(4-5\sqrt{5})$

2. anonymous

Foil it out.

3. anonymous

how do i dow the sqrt 10 and sqrt 5 with foil?

4. anonymous

Multiply them.

5. anonymous

$3\sqrt{10} \times -5\sqrt{5} = (3 \times -5)(\sqrt{10}\times\sqrt{5})$

6. anonymous

$=-15 \sqrt{50} = -15(5\sqrt{2}) = -75\sqrt{2}$

7. anonymous

8. anonymous

so its $-75\sqrt{2}$

9. anonymous

Well, that's the result of $3\sqrt{10} \times -5\sqrt{5}$

10. anonymous

You still need to foil the rest of your terms.

11. anonymous

foiled i got $8\sqrt{100}$

You have a problem whose solution ain't gonna be pretty!

13. anonymous

Well you got one of the terms, just continue your multiplication, next multiply the $-5\sqrt{5}\times 2$

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!

A loss is a gain without effort.

Find more explanations on OpenStudy