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# Indices Simplification watch

1. Attachment 699322

(^photo of the question)

Hi! I've been given 3 solutions, and am asked which one is correct and why.

I know it is not B (square root of 16 is not 8) but am a bit stuck with the other two.

I thought C was the correct solution, but I heard some teachers saying it was A.

Could someone tell me if A is correct? And if it is, why?

Thanks!
2. (Original post by TeacupAndTragedy)
Attachment 699322

(^photo of the question)

Hi! I've been given 3 solutions, and am asked which one is correct and why.

I know it is not B (square root of 16 is not 8) but am a bit stuck with the other two.

I thought C was the correct solution, but I heard some teachers saying it was A.

Could someone tell me if A is correct? And if it is, why?

Thanks!
Try plugging in some simple numbers into the original expression and the options and u can identify the correct one.

Is root(3^2 + 4^2) the same as 3+4
3. (Original post by Shaanv)
Try plugging in some simple numbers into the original expression and the options and u can identify the correct one.

Is root(3^2 + 4^2) the same as 3+4
Sorry- I'm not sure where you got that from.. Could you explain for me please?

(I do know it's not the same though 😊)
4. (Original post by TeacupAndTragedy)
Sorry- I'm not sure where you got that from.. Could you explain for me please?

(I do know it's not the same though 😊)
Pick a value of x=1 and y=2 for example. Put this into the expression you have to simplify and record the answer. Put the same values into each of the given solutions, if one gives u the same answer then u know that is the correct answer.

The example is just one i made up that is kinda similar to ur question, for simplicity i chose easy numbers. However u should be able to apply the same knowledge to ur question.
5. (Original post by Shaanv)
Pick a value of x=1 and y=2 for example. Put this into the expression you have to simplify and record the answer. Put the same values into each of the given solutions, if one gives u the same answer then u know that is the correct answer.

The example is just one i made up that is kinda similar to ur question, for simplicity i chose easy numbers. However u should be able to apply the same knowledge to ur question.
Alright... I'll try that. Thank you!

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