surds ?? wtf

Reply 20

OP

1

o lol k thanks....

just got one more thing..to do with surds and pythagroses theorm (sp)
if the base is √5 and height is 1 how do u work out the hypotonuse. ?

Reply 21

Mark S

17

Nutchopper

Surds are irrational numbers, they are numbers which cant be written as a fraction. An example of a surd is √2.
There are two rules when mutliplying surds: Here they are:
√ab = √a x √b

and

√a √a
-- = ---
b √b
Where a and b are numbers, i hope that helps a little bit, pm me if you need any more help.

Bloody hell nutchopper, you're so damn smart.

This is all chinese to me.

Reply 22

~NC~

11

Markus

Bloody hell nutchopper, you're so damn smart.

Thanks!

Gibb in answer to your question im not really sure, as ilike to saee these things written out properly but could your perhaps square the √5 and add 1 ^2?? Im not sure sao dont hold me to that lol.

Reply 23

stop-drop-n-lol

OP

1

Bloody hell nutchopper, you're so damn smart.

thanks any way....i just surf the web for some more explanations

Reply 24

Mark S

17

GiBB

thanks any way....i just surf the web for some more explanations

ja ja, anyway didnt you cover surds in higher tier maths? I know my friends did so i assume that if you're doing AS maths than you did higher tier for gcse.

Reply 25

~NC~

11

GiBB

:dito:

thanks any way....i just surf the web for some more explanations

Lol thanks, sorry i coulkdnt help on that question!

Reply 26

stop-drop-n-lol

OP

1

i did intermediate gcse for maths :redface:

so we didnt cover it....i got a B for maths so I was told I should be able to handle the work...hopefully

Reply 27

~NC~

11

A B is still good and as long as you work hard youll easily be able to acheive a good result!

Reply 28

stop-drop-n-lol

OP

1

cheers.....i think im gonna go the library and get a few books out...

thanks help peeps.

Reply 29

Mark S

17

GiBB

i did intermediate gcse for maths :redface:

so we didnt cover it....i got a B for maths so I was told I should be able to handle the work...hopefully

okily dokily. If you did higher you might be at an advantage, since surds and stuff like that appaear in higher tier :smile:

Reply 30

~NC~

11

No problem have fun at library!

Reply 31

Gaz031

15

GiBB

o lol k thanks....

just got one more thing..to do with surds and pythagroses theorm (sp)
if the base is √5 and height is 1 how do u work out the hypotonuse. ?

$h^{2}=(\sqrt{5})^2+1^2=6$ and so $h=\sqrt{6}$ as $h>0$
A small note: $\sqrt{a+b}$ is NOT equal to $\sqrt{a}+\sqrt{b}$ - that's one of the more common mistakes along with the false statements $(a+b)^{2}=a^2+b^2$ and $\sin (A+B)=\sin A + \sin B$

Reply 32

SketchyCanvas~

10

^^ we havent done those yet, we also started Surds too, kinda confusing but easy to begin with.

Reply 33

stop-drop-n-lol

OP

1

Gaz031

$h^{2}=(\sqrt{5})^2+1^2=6$ and so $h=\sqrt{6}$ as $h>0$
A small note: $\sqrt{a+b}$ is NOT equal to $\sqrt{a}+\sqrt{b}$ - that's one of the more common mistakes along with the false statements $(a+b)^{2}=a^2+b^2$ and $\sin (A+B)=\sin A + \sin B$

WTF!! noooooooo my brain!!!

i just got some books on surds and ive got how to do it now!

Reply 34

Cb.Incus

5

lol. I have managed to grasp a fundamental understanding of surds, but I am having trouble working out how to put questions that involve a√b in the simplest form.
Examples of question.

A) 5√7 - 2√7

B) 3√7 + √28

C)3√22 X √33

D) 10
____

√7 - √2

If anyone can show me how to solve any of the above that will be much appreciated. Maths homework in for tomorrow, fun times.
Thanks.

Reply 35

Cb.Incus

5

I can solve questions once the route of how to solve it has been explained.

Ok, i'll have another attempt at bashing both my brain cells together, might create a brain wave.

Reply 36

Chewwy

17

Cb.Incus

lol. I have managed to grasp a fundamental understanding of surds, but I am having trouble working out how to put questions that involve a√b in the simplest form.
Examples of question.

A) 5√7 - 2√7

B) 3√7 + √28

C)3√22 X √33

D) 10
____

√7 - √2

If anyone can show me how to solve any of the above that will be much appreciated. Maths homework in for tomorrow, fun times.
Thanks.

there's this great thing called the maths forum. anyway...

a) 5√7 - 2√7 = 3√2

b) 3√7 + √28 = 3√7 + √2√2√7 = 3√7 + 2√7 = 5√7

C) 3√22 * √33 = 3√2√11√3√11 = 33√2√3 = 33√6

d) 10/(√7 - √2) = 10/(√7 - √2) *(√7 + √2)/(√7 + √2) = (10(√7 + √2))/(7 - 2) = 2(√7 + √2)

Reply 37

Cb.Incus

5

Thanks Chewwy.

I shall pop in to the Maths forum if I need further help, but on this occasion I thought I would post my questions in this topic, as related discussion.

would you like positive or negative rep? I could try and boost you back up to green or carry on with the red ? (Some people prefer to go different ways ?)

Reply 38

Chewwy

17

Cb.Incus

Thanks Chewwy.

I shall pop in to the Maths forum if I need further help, but on this occasion I thought I would post my questions in this topic, as related discussion.

would you like positive or negative rep? I could try and boost you back up to green or carry on with the red ? (Some people prefer to go different ways ?)