Math Test, Please Help

[Nuka-sama]

oh damn. i copied the equation wrong.
there we go

I also don't get this one: Please explain a little more

 

[b etor]

This one I don't get: Don't you have to find a common denominator?

no. you only need common denominators in addition and subtraction

 

[Nuka-sama]

NVM, I get 17 now. Thank you B etor

Are you in Mrs. Rockwoods?

 

[b etor]

I also don't get this one: Please explain a little more

better?

 

[b etor]

oh. too late, it's more colorful now.

mrs. rockwoods!? no, i have no idea who that is. lol

and ANY TIME! =]

 

[Nuka-sama]

oh. too late, it's more colorful now.

mrs. rockwoods!? no, i have no idea who that is. lol

and ANY TIME! =]

I get it, thanks

The Math Teacher at my boarding school

How about next week

 

[b etor]

oh. i definitely don't go to your school. haha.

sure thing.

do you have any messanger services? it might be faster/more efficient that way so i could explain it better

 

[warpus]

b'etor can you help me with my math homework sometime?

 

[b etor]

ok!!!!!

 

[Nuka-sama]

Mrs. Rockwood's Blitzkreig strikes again

I have to simplify

 

[Red Door]

Is that root 1 over 5 or 1 over 5, all square-rooted?

 

[warpus]

Mrs. Rockwood's Blitzkreig strikes again

I have to simplify

sqrt(5) + sqrt(1/5)
= sqrt(5) + sqrt(1)/sqrt(5)
= sqrt(5)sqrt(5)/sqrt(5) + sqrt(1) / sqrt(5)
= [ sqrt(5)^2 + sqrt(1) ] / sqrt(5)
= ( 5 + 1 ) / sqrt(5)
= 6 / sqrt(5)

did i make a mistake anywhere?

 

[Nuka-sama]

Is that root 1 over 5 or 1 over 5, all square-rooted?

Bolded ten char

 

[Gogf]

did i make a mistake anywhere?

No.

sqrt(5) + sqrt(1/5) = x
sqrt(25/5) + 1/sqrt(5) = x
5/sqrt(5) + 1/sqrt(5) = x
x = 6/sqrt(5)

 

[Irish Caesar]

= 6 / sqrt(5)

did i make a mistake anywhere?

It's solid, except that a radical sign cannot be in a denominator.

6/sqrt(5)
= 6/sqrt(5) * sqrt(5)/sqrt(5)
= [6*sqrt(5)]/5

 

[Nuka-sama]

sqrt(5) + sqrt(1/5)
= sqrt(5) + sqrt(1)/sqrt(5)
= sqrt(5)sqrt(5)/sqrt(5) + sqrt(1) / sqrt(5)
= [ sqrt(5)^2 + sqrt(1) ] / sqrt(5)
= ( 5 + 1 ) / sqrt(5)
= 6 / sqrt(5)

did i make a mistake anywhere?

No square roots on bottom

 

[Gogf]

No square roots on bottom

6*sqrt(5)/5

 

[Gogf]

It's solid, except that a radical sign cannot be in a denominator.

6/sqrt(5)
= 6/sqrt(5) * sqrt(5)/sqrt(5)
= [6*sqrt(5)]/5

As far as I know, people used to use that because it's much easier to estimate the value of something with a radical in the numerator than the denominator. That's not much of an issue anymore now that we have calculators, though. Not that it's really that difficult to multiply by sqrt(5)/sqrt(5) or that we don't have the same rule...

 

[warpus]

Right..

It's a simple problem but I rather rushed it and that's just being picky

 

[Irish Caesar]

As far as I know, people used to use that because it's much easier to estimate the value of something with a radical in the numerator than the denominator. That's not much of an issue anymore now that we have calculators, though. Not that it's really that difficult to multiply by sqrt(5)/sqrt(5) or that we don't have the same rule...

Sure, but if one could simply use a calculator, one would not be learning said lesson in the first place. A negative number can't be in a denominator, either, technically, but again, that doesn't really matter to my TI-83+.

Right..

It's a simple problem but I rather rushed it and that's just being picky

Sure, but if the guy has to see how it's done, might as well show as many steps as possible, no?