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# expansion watch

1. Expand (1+rootx)^3
The mrk scheme was such that instead, for exmple rootx times rootx being x, it was rootx^2, which i dont really get. If anyone could help me out i would really appreciate it.
Sorry for the awful spelling, im on a partialy broken tablet.
2. (Original post by daviem)
Expand (1+rootx)^3
The mrk scheme was such that instead, for exmple rootx times rootx being x, it was rootx^2, which i dont really get. If anyone could help me out i would really appreciate it.
Sorry for the awful spelling, im on a partialy broken tablet.
That is a bit weird but I'm sure if you just had x that would be accepted.
3. (Original post by daviem)
Expand (1+rootx)^3
The mrk scheme was such that instead, for exmple rootx times rootx being x, it was rootx^2, which i dont really get. If anyone could help me out i would really appreciate it.
Sorry for the awful spelling, im on a partialy broken tablet.
What was the answer shown on the mark scheme? Was it something like 1 + 3x + 3x^2 + x^3 as I don't quite understand.

It is a bit unusual though.
4. (Original post by SeanFM)
That is a bit weird but I'm sure if you just had x that would be accepted.
It didnt say any equivalent or whatever though
5. (Original post by Peppercrunch)
What was the answer shown on the mark scheme? Was it something like 1 + 3x + 3x^2 + x^3 as I don't quite understand.

It is a bit unusual though.
Mark scheme answer was rootx^3 + 3rootx^2 + 3rootx +1
6. You're talking about the 2014 C2 AQA paper? If yes, you use the answer from previous question as it says "hence" and so the answer will be 1 + 3rootx + 3x + rootx^3

it is 3x as 3(rootx)^2 is rootx times by rootx so it becomes x
7. (Original post by daviem)
Mark scheme answer was rootx^3 + 3rootx^2 + 3rootx +1
Ah, I see. They kept the roots in the answer. Yea, I don't understand why they kept them.
8. (Original post by Jakz007)
You're talking about the 2014 C2 AQA paper? If yes, you use the answer from previous question as it says "hence" and so the answer will be 1 + 3rootx + 3x + rootx^3

it is 3x as 3(rootx)^2 is rootx times by rootx so it becomes x
Oh, so it wants you to use the same structure.....didnt see that, thznks
9. Thanks everyine, got it now from jackz007

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