Simplify expression

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Apr 19th 2013, 01:34 AM
mrtn

Simplify expression

Hi there

Can anyone tell me how to simplify this expression

d/sqrt(2*A*d/h)*A+sqrt(2*A*d/h)/2*h

to this expression

sqrt(2*A*d*h)

Thank you i advance :)
Apr 19th 2013, 02:01 AM
Draco93

Re: Simplify expression

Would be more easier to read if we had some brackets to make the expression less ambiguous. Otherwise, there's a bit of guess work involved.
Apr 19th 2013, 02:18 AM
mrtn

1 Attachment(s)

Re: Simplify expression

Sorry. Would this be all right:

Attachment 28024
Apr 19th 2013, 04:43 AM
Soroban

Re: Simplify expression

Hello, mrtn!

Quote:

$\text{Show that: }\:\left(\frac{d}{\sqrt{\frac{2Ad}{h}}}\times A\right) + \left(\frac{\sqrt{\frac{2Ad}{h}}}{2} \times h\right) \;=\;\sqrt{2Adh}$

The first product is:

. . $\displaystyle\dfrac{d}{\frac{\sqrt{2}\sqrt{A}\sqrt {d}}{\sqrt{h}}} \cdot A \;=\; \frac{Ad\sqrt{h}}{\sqrt{2}\sqrt{A}\sqrt{d}} \;=\; \frac{\sqrt{A}\sqrt{d}\sqrt{h}}{\sqrt{2}} \;=\;\frac{\sqrt{Adh}}{\sqrt{2}}$

The second product is:

. . $\displaystyle\dfrac{\frac{\sqrt{2}\sqrt{A}\sqrt{d} }{\sqrt{h}}}{2} \cdot h \;=\; \dfrac{\sqrt{2}\sqrt{A}\sqrt{d}\,h}{2\sqrt{h}}\;= \; \frac{\sqrt{A}\sqrt{d}\sqrt{h}}{\sqrt{2}} \;=\; \frac{\sqrt{Adh}}{\sqrt{2}}$

Their sum is:

. . $\displaystyle\frac{\sqrt{Adh}}{\sqrt{2}} + \frac{\sqrt{Adh}}{\sqrt{2}} \;=\; \frac{2\sqrt{Adh}}{\sqrt{2}} \;=\;\sqrt{2}\sqrt{Adh} \;=\;\sqrt{2Adh}$
Apr 19th 2013, 04:57 AM
cindrella

Re: Simplify expression

i like algibra
Apr 19th 2013, 05:29 AM
mrtn

1 Attachment(s)

Re: Simplify expression

Thank you Soroban.

My next challenge is to simplify the first product as you just wrote (I know I am on deep water):

Show that Attachment 28027

I need to know step by step, which math rules are used etc. to get the final expressions.

Do you know any software, which are able to help me with this?

Or else I can keep you guys busy, like forever.
Apr 19th 2013, 03:26 PM
unkle

Re: Simplify expression

algebra.help gets you half way there I am student and I am sure there is a law to follow for algebra hope the link helps you to help yourself