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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)