1)

2)

3)

4)

If there are any mistake please correct them?

Thank you..

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- Oct 6th 2009, 12:13 PMmj.alawamiCheck my limits Solution
1)

2)

3)

4)

If there are any mistake please correct them?

Thank you.. - Oct 6th 2009, 12:44 PMGrandad
- Oct 7th 2009, 01:48 AMmj.alawami
- Oct 7th 2009, 01:58 AMmr fantastic
- Oct 7th 2009, 07:58 AMGrandad
Hello mj.alawami

Use Mr F's substitution, or you can do it directly, by writing as .

Note first what happens when you multiply out the brackets from , using the laws of indices:

So we can factorise the denominator:

So

Question 4 can be done in the same way. Start with

...which is basically the same as #3, with replaced by .

Grandad