1)
2)
3)
4)
If there are any mistake please correct them?
Thank you..
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