I am having difficulty solving these surds problems

and

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- Jun 4th 2009, 12:05 AMb3nj1dsurds
I am having difficulty solving these surds problems

and

- Jun 4th 2009, 12:24 AMalexmahone

- Jun 4th 2009, 12:30 AMProve It
Since we haven't learnt FOIL yet, I understand why you're having trouble with the first one.

If you have two binomials like , they are expanded by multiplying the Firsts, then the Outers, then the Inners, then the Lasts.

So .

So for your first one, you have

Multiplying the firsts gives .

Multiplying the outers gives

Multiplying the inners gives

Multiplying the lasts gives .

So

.

For the second, you need to simplify all of the surds first. Then hopefully you'll have "like surds" that can be collected.

.

.

.

So

.

Chookas for the exam tomorrow.