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# Help in maths watch

1. Help
2. ????
3. wat?
4. (Original post by Diya haresh)
wat?
click on the attachment
5. (Original post by yemenia16)
Help
Help with what? Never mind I see what it is.
6. (Original post by M4cc4n4)
Help with what? The first part?
Yh is my working out correct?
7. (Original post by yemenia16)
Yh is my working out correct?
If my first glance is correct then you made a error but I'd have to check for myself
8. (Original post by M4cc4n4)
If my first glance is correct then you made a error but I'd have to check for myself
Okay
9. If you're trying to rationalise the denominator, then you need to add instead of subtract on the bottom

ie (3rt2 - 3) * (3rt2 +3) on the bottom

This uses the idea of 'difference of two squares' to get rid of the rt2 on the bottom completely
10. rather than multiplying top and bottom by 3-rt2, multiply by 3+rt2. If simplified correctly you should get rt 2 as the length of l, as 3rt2 times rt2 = 6, hope this helped
11. (Original post by SaMarlo)
If you're trying to rationalise the denominator, then you need to add instead of subtract on the bottom

ie (3rt2 - 3) * (3rt2 +3) on the bottom

This uses the idea of 'difference of two squares' to get rid of the rt2 on the bottom completely
Spot on, OP needs to work on Surds multiplication as well but I'm sure they will get there

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