Question

Can some one help me multiply (7+sqrt 2) (8-3 sqrt 2)?

Answer 1

Yes, I can help.

Answer 2

Do you have any idea of what to do? Or where you might possible begin?

Answer 3

My first reaction is to do foil method.

Answer 4

And you would be correct.

Answer 5

So i start with 7 *8

then \[7 * 3\sqrt{2}\]?

Answer 6

second part is 7 * -3sqrt2

Answer 7

When im done with foil what do i do?

Answer 8

*sigh*

(7+sqrt 2) (8-3 sqrt 2)

\[(7+\sqrt{2}) (8-\sqrt{2})\]

\[56+8\sqrt{2}-21\sqrt{2} -3(2)\]

\[56-13\sqrt{2}-6\]

\[50-13\sqrt{2}\]

Answer 9

So after foil just combine every thing?