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# C1 indices/ surd question

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1. can anyone go through this question step by step? I don't get how to solve it. Thanks.
2. .

<---- be careful with this one.
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3. (Original post by coconut64)
can anyone go through this question step by step? I don't get how to solve it. Thanks.
Step 1: : this gives

Step 2: , this gives:

Step 3: so that

Step 4:

Step 5: so

Step 6: so

Can you finish off from here?
4. (Original post by Zacken)
Step 1: : this gives

Step 2: , this gives:

Step 3: so that

Step 4:

Step 5: so

Step 6: so

Can you finish off from here?
I think this is right?
5. (Original post by coconut64)
I think this is right?
Perfect. First class work.
6. (Original post by coconut64)
I think this is right?
hmmm. try x=-1 and see if this works
7. (Original post by B_9710)
.

<---- be careful with this one.
Spoiler:
Show
Thanks
8. (Original post by coconut64)
Thanks
I have to say, you did not get the right answer. As I said try any negative value of x and see if you get the same answer from the original expression and the final one you posted.
It is right if there is a condition stated somewhere that .
9. (Original post by coconut64)
Thanks
Would the question happen to have a condition that you haven't shown us? I'd think so.
10. (Original post by Zacken)
Would the question happen to have a condition that you haven't shown us? I'd think so.
Not really.
11. (Original post by B_9710)
I have to say, you did not get the right answer. As I said try any negative value of x and see if you get the same answer from the original expression and the final one you posted.
It is right if there is a condition stated somewhere that .
True but it works with a positive number tho. This is a non calculator exam so I would probs to go along with it. The question doesn't give other info BTW. Thanks.
12. (Original post by coconut64)
Not really.
Oh well, it's just crappy question writing on Edexcel's part, nothing you need worry about at this stage.

Spoiler:
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The reason why this is technically incorrect is that .
13. I'm saying the answer is .
14. (Original post by Zacken)
Oh well, it's just crappy question writing on Edexcel's part, nothing you need worry about at this stage.
Spoiler:
Show
The reason why this is technically incorrect is that .
Oh that I have abosolutely no clue what it is. I don't do further maths. Thanks again.
15. (Original post by coconut64)
Oh that I have abosolutely no clue what it is. I don't do further maths. Thanks again.
No problem.

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