simplify..need help

**wolfhound** · January 28th 2010, 12:17 PM

Hello,
Please look at my picture

I need someone to show me how to get the end bit of my sum finished, the correct answer is in green I cant seem to get it?
Please help

**pickslides** · January 28th 2010, 12:24 PM

$4T^2 = 8S^2$

$\frac{T^2}{2} = S^2$

$\sqrt{\frac{T^2}{2}} = S$

$\frac{T}{\sqrt{2}} = S$

**wolfhound** · January 28th 2010, 12:31 PM

Can someone show me how to get the answer in green on my picture please????

**wolfhound** · January 28th 2010, 12:47 PM

Originally Posted by pickslides

$4T^2 = 8S^2$

$\frac{T^2}{2} = S^2$

$\sqrt{\frac{T^2}{2}} = S$

$\frac{T}{\sqrt{2}} = S$

Sorry but this is not the answer in the green?

**wolfhound** · January 28th 2010, 12:55 PM

Is there any kind helpful people that can show me how to get the correct answer in green on my picture please????

**pickslides** · January 28th 2010, 01:01 PM

Originally Posted by wolfhound

Is there any kind helpful people that can show me how to get the correct answer in green on my picture please????

You need to rationalise the denominator in my post, that will give you the answer you require.

Also please learn some LaTex to help us help you. Your paint attachments are hard to decipher.

**pickslides** · January 28th 2010, 01:06 PM

Originally Posted by wolfhound

Its wrong? Why did you post it if you knew its wrong?
Its no good.

What are you rambling now?

$S = \frac{T}{\sqrt{2}}\times \frac{\sqrt{2}}{\sqrt{2}}$

Now finish it!

**CaptainBlack** · January 28th 2010, 01:06 PM

Originally Posted by wolfhound

the answer is in a textbook, so thats wrong and you are right?
If you dont like the style of my posts dont bother reading them , your the first person to complain about them. I'm happy without latex

$\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}$

CB

**masters** · January 28th 2010, 01:07 PM

Originally Posted by wolfhound

Its wrong? Why did you post it if you knew its wrong?
Its no good.

Hi wolfhound,

Now, now let's be nice.

Here's the flow from where you started:

$4t^2-8s^2=0$

$-8s^2=-4t^2$

$s^2=\frac{1}{2}t^2$

$s=\sqrt{\frac{1}{2}t^2}$

$s=\frac{\sqrt{t^2}}{\sqrt{2}}$

$s=\frac{t}{\sqrt{2}}$

This is what Pickslides gave you. Now, you must rationalize the denominator.

$s=\frac{t}{\sqrt{2}}\cdot \frac{\sqrt{2}}{\sqrt{2}}$

$s=\frac{t\sqrt{2}}{2}$

${\color{green}s=\frac{1}{2}t\sqrt{2}}$

**wolfhound** · January 28th 2010, 01:10 PM

Originally Posted by masters

Hi wolfhound,

Now, now let's be nice.

Here's the flow from where you started:

$4t^2-8s^2=0$

$-8s^2=-4t^2$

$s^2=\frac{1}{2}t^2$

$s=\sqrt{\frac{1}{2}t^2}$

$s=\frac{\sqrt{t^2}}{\sqrt{2}}$

$s=\frac{t}{\sqrt{2}}$

This is what Pickslides gave you. Now, you must rationalize the denominator.

$s=\frac{t}{\sqrt{2}}\cdot \frac{\sqrt{2}}{\sqrt{2}}$

$s=\frac{t\sqrt{2}}{2}$

${\color{green}s=\frac{1}{2}t\sqrt{2}}$

Thank you very much

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