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# Surd Help watch

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1. Just working through the P1 thing, and I'm stuck on this excerise.
NOTE: For the below # is the square root /surd sign.
These are all RATIONALISING THE DENOMINATOR.

PROBLEM A
1 / #3 - 1
I changed this and ended up with
1 (-1 - #3) / -1 + #3 (-1 - #3)
Which i then worked to get
-1 - #3 / - 2
Is there anything else to do?

PROBLEM B
#43 - #23 / #43 + #23
What???????
2. (Original post by virtuality)
Just working through the P1 thing, and I'm stuck on this excerise.
NOTE: For the below # is the square root /surd sign.
These are all RATIONALISING THE DENOMINATOR.

PROBLEM A
1 / #3 - 1
I changed this and ended up with
1 (-1 - #3) / -1 + #3 (-1 - #3)
Which i then worked to get
-1 - #3 / - 2
Is there anything else to do?

PROBLEM B
#43 - #23 / #43 + #23
What???????
a) Yes, this can be further simplified:

-1 - #3 / - 2 = (1+√3)/2

b) (√43 - √23)/(√43+√23)

multiply top and bottom by (√43-√23)
3. (√43 - √23)(√43 - √23)
How you do that?
Whats √43 x - √23??
4. (Original post by virtuality)
(√43 - √23)(√43 - √23)
How you do that?
Whats √43 x - √23??
Remember, √a * √b = √(ab)

So,

(√43 - √23)(√43 - √23) = 43 - 2√989 - 23 = 20 - 2√989
5. whats command for the sqrt sign ? alt + some numbers ?
6. (Original post by Revelation)
whats command for the sqrt sign ? alt + some numbers ?
you cant do that, the best you can do is use the character map (its unicode 221A by the way)
7. thats so tedious D:
8. (Original post by Revelation)
thats so tedious D:
9. thats easy now but what if it aint there, oh well ill just use sqrt(x)
10. (Original post by Revelation)
thats easy now but what if it aint there, oh well ill just use sqrt(x)
Character map.
11. mmm... but character map is so far away (see above)
12. use my signature
13. lol thanks

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