If someone could help me slove a few exercises ,I realy need them?

I would need them by Wednesday.

And sorry me english is bad.

Here they are:

http://img337.yfrog.com/img337/2927/mata2b.png

Thanks!

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- March 29th 2010, 12:09 PMThaurusSome exercises
If someone could help me slove a few exercises ,I realy need them?

I would need them by Wednesday.

And sorry me english is bad.

Here they are:

http://img337.yfrog.com/img337/2927/mata2b.png

Thanks! - March 29th 2010, 12:44 PMDeadstar
Will help with a couple... Please show any working so we know what you have done. I'll give you the answers as well but you'll need to some of your own working...

First question.

by expanding.

Then use .

ANSWER: 2

Second question.

Use the fact that and replace and with and .

ANSWER: (however this can be further simplified, I'll leave that up to you, use the hint in the next question)

Third question.

, hence for this question... so . Substitute in the equation.

ANSWER: - March 29th 2010, 01:34 PMSoroban
Hello, Thaurus!

Quote:

. .

. . . .

. . . .

. . . .

The fraction becomes: .

Quote:

. . . .

- March 29th 2010, 01:37 PMDeadstar
- March 29th 2010, 02:00 PMDeadstar
- March 29th 2010, 06:44 PMSoroban
Hello again, Thaurus!

Quote:

1690. Evaluate: .

We have: .

Divide top and bottom by

Substitute

Quote:

We have: .

- March 30th 2010, 08:08 AMThaurus
Thanks!

I did it myself , am I am right? - March 30th 2010, 08:32 AMDeadstar