I broke maths.

[Lasercookie]

From what I know I would approach it as:




and then use the sum of two cubes:


Then expand and simplify


I suspect what I'm doing is going about it the long way around or incorrect.

You could also initially do:

[luffy]

YO. I'm back.

Can someone show me their workings for this following question?:

Factorise:

Thanks a lot.

Now, use the sum of cubes:






You would then have to factorise the quadratic factor - However, I'll let you do that Alternatively, you could simply expand the initial expression, simplify and then factorize, but that will be slightly longer.

Also, note that the above post (by Laseredd) is not 100% correct. You cannot simply expand the 125 and 27 into their brackets. That would be breaking one of the index laws. It would however, be correct to expand the brackets by 5 and 3 respectively. (If that makes sense)

i.e.  

Hope I helped.

[Lasercookie]

Also, note that the above post (by Laseredd) is not 100% correct. You cannot simply expand the 125 and 27 into their brackets. That would be breaking one of the index laws. It would however, be correct to expand the brackets by 5 and 3 respectively. (If that makes sense)

i.e. 

Yeah I suspected that I did something wrong with my working out. Thanks for clearing up what my mistake was.

[Hutchoo]

Luffy, I did what you did.. But the answer in the back of the book is different.

[Lasercookie]

I got the same answer as the book, I'll finish what I'm doing now and type it up pretty soon





and then just sum of two cubes

Expanding and simplifying gets you:






edit: probably more helpful if I show my complete working

[luffy]

Sorry - I made a slight error in my calculations.

I'll edit my original post

[Hutchoo]

Yo.

Uh... I don't really know how to do this and I'm a bit confused.

Using your CAS, find the instantaneous rate of change of at:


So.. I just expanded it using my CAS and got:


Now I assume that you differentiate it and then sub ?

If so.. How the hell do you diff fractions?

Thanks

[TrueTears]

[Hutchoo]

Ty mang <3

Question: How would you find the total distance traveled from reading this graph (attached)?

[moekamo]

the particle goes from 0m down to -1m (travels 1m) then up to 2m(travelling another 3m) then down to -5m(travelling another 7m)

so the total distance is 1+3+7 = 11m

[Hutchoo]

Hi guys, I need help with (C)
Not really understanding how it works :/

The answer is 2q.

Thanks =)

[luken93]

See attached

(Not to scale haha)

[TrueTears]

AD is double of BC hence 2q

[Hutchoo]

How about BF?

[TrueTears]

let x = CD = AF

p+q+x=2q

x = q-p

BF = AF-AB = q-p-p=q-2p