Thread: Subtraction of binomial fractions?

I'm SO close to getting the answer, but where do I go from here?

http://oi42.tinypic.com/2505ct3.jpg

you cannot take (which you've done in 3rd step) just expand and simplify

Are you sure? Why can't I do that?

Edit: Either way I get the same answer, which I don't know what to do with..

Remember

Spoiler:

Please avoid attachements if possible

because you, yourself has taken at one point (on the fifth line)

so clearly it is not (x^2+30^2)

Originally Posted by pickslides

Remember

Spoiler:

Please avoid attachements if possible

Thank you very much, sorry about the attachment!

So.. How did you just do that?

Originally Posted by AlexWilson94

Are you sure? Why can't I do that?

pick a=2 and b=3, try it for both sides, are they the same?

Originally Posted by BAdhi

because you, yourself has taken at one point (on the fifth line)

so clearly it is not (x^2+30^2)

Oohh.. My bad on that.. Sorry, thank you!

Originally Posted by pickslides

pick a=2 and b=3, try it for both sides, are they the same?

It clicks now.. Got it, thanks for clearing that up!

Originally Posted by AlexWilson94

So.. How did you just do that?

With pen and paper, you have been told where you went wrong, so have another go at it, post your attempts if you need further clarification.

You even have the answer now to help you check!

So from the 3rd line, I went:

(10x^2 + 9000) - (30x^2 + 1000) = 0
-20x^2 + 6000 = 0
6000 = -20x^2

Then I took the square root of both sides, then divided to square root of 6000 by 20, and wualah. x=3.87

Edit: By the way, how do you get the math symbols?

Originally Posted by AlexWilson94

So from the 3rd line, I went:

(10x^2 + 9000) - (30x^2 + 1000) = 0
-20x^2 + 6000 = 0
6000 = -20x^2

Then I took the square root of both sides, then divided to square root of 6000 by 20, and wualah. x=3.87

This does not look correct.

Form your working

Originally Posted by AlexWilson94

Edit: By the way, how do you get the math symbols?

Put "tex" tags around your equations

[/tex]

Originally Posted by pickslides

This does not look correct.

Form your working






Put "tex" tags around your equations

Oh my bad, I forgot to take out the negative when I posted it here.
It's supposed to be 20x^2, since I added it to both sides. Thanks!