Math Is Fun Forum

34. (sqrt)3{5(sqrt)s +(sqrt)3} I come up with 8(sqrt)6  am I on the right track or do I need to buy a whole new train??

38 {(sqrt)c +d}{3+(sqrt)5} I get 8(sqrt)6+3d+d(sqrt)5????

Last one 14/{60 -(sqrt)578} no idea where to start even??

Any and all help would be great but I'd rather get started in the right directions over just getting the answers...thank again! A

1. 8/(x+4) +1 = 5x/(x^2-2x-24)

2. 2x(x+3) -  x/(x+7) = (x^2-1)/(x^2+10x+21)

Any one able to show me where to start after figuring out the LDC would be my hero for the day!

The LDC for 1 is (x-6)(x+4)
and far 2 it's (x+3)(x+7) correct?

I think I;ve got these right but mom's gone for the week and dad won't even look at math over 4th grade??? So please if any one could tell me if I have these right and just tell me which are wrong so I can try firguring the ones I have wrong again! APB   The instructions on 2-58 just say Simplifiy the Expression...

1.(x+3)/(x^3-x^2-6x) Divided by  ((x^2-9)/ x^2+x-12)= (x+4)/ (x)(x+2)(x-3)

2. (x^3+x^2)/(x^2-16)  *  (x+4)/(3x^4+x^3-2x^2) = 1/(x-4)

3.(12x-4)/(x-1)  +  (4x)/(x-1) = 48x

4. (5)/(2x^2)  + (4)/(3x)  =  (8x+15)/(6x^2)

5. (4)/(x+3)  +  (3x)/(x-2) = (3x^2+4x+1)/(x^2 +x-6) Should I simplifiy that down  to (3x+1)(x+1)/(x+3)(x-2) or not???

6. (5x+1)/(x-3) - (2x)/(x-1)  =  (7x^2-4x-3)/(x^2-4x+3)  I haven't broken it down as I can't tell if I;m suppose to?

I just gave them number 1-6 out of 56 I have done! The rest look right but these 6 I'm not sure on!

Again please just tell me if I'm right as I really want to figure them out by myself! Thanks... APB

T^2 -16T +65=0

I've tried the Quadratic formula
Factoring  and Graphin but  65 only factors are
1 *65  and
5*13???
Any one have any ideas??? Please??? Mom's lost...and My son had left this problem after working on it for over an hour! Thanks Mom

What is the largest power k such as 3^k divides easily into 40? With out anyremainders?
a. 1
b. 4
c. 13
d. 17
e. none of these

I know a can't be right as 40 is to even of a number to be that only.
but do I use the k like tha other problem with 1/2^3, 1/2^4...and so on? Or is there another one???

My daughter had to miss math class for a music event and wants me to check her answers??? So here I am looking for help~

Find the sum of the first 100 terms of the aruthmetic sequence 19, 13 ,7,.....?  We came up with b

a. -58,100
b. -556
c. _27,800
d. -55,600
e. nnone of these