Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

Login

Username

Password

Not registered yet?

Post a reply

Go back

Write your message and submit
:) :| :( :D :o ;) :/ :P :lol: :mad: :rolleyes: :cool: | :dizzy :eek :kiss :roflol :rolleyes :shame :down :up :touched :sleep :wave :swear :tongue :what :faint :dunno
Options

Go back

Topic review (newest first)

ganesh
2005-07-08 15:27:03

Its always difficult to find the factors, given the simplest form.
a^3 - b^3 is (a-b)(a^2 + ab + b^2).
If one of the factors is known, it becomes a bit easier.
For lower degrees, by remembering some formulae, it can be done easily.
Like a^2 - b^2 = (a+b) x (a-b),
(a^3 + b^3) = (a+b) x (a^2 - ab + b^2) etc.
When you are aksed to prove that the LHS is equal to the RHS,
it is always better to start with lower degrees.

Kandai
2005-07-08 09:53:51

I know how to get from here:

-2(w-5)(w+5)(w^2+25)

to here:

-2w^4+1250

But I don't know how to get from here:

-2w^4+1250

to here:

-2(w-5)(w+5)(w^2+25)


The same with this problem:
a^9-1
(a-1)(a^2+a+1)(a^6+a^3+1)

Board footer

Powered by FluxBB