Is there a quick way to expand: (3x + 5)(x - 7)?

(Crying)

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- December 2nd 2010, 05:58 PMAJDHelp with binomial expansions
Is there a quick way to expand: (3x + 5)(x - 7)?

(Crying) - December 3rd 2010, 12:58 PMpickslides
Using a computer will be quite quick.

Its not a tricky one though, have you seen the F.O.I.L method? - December 3rd 2010, 01:03 PMe^(i*pi)
- December 3rd 2010, 01:33 PMArchie Meade
This is a good example where you may say "and" instead of "plus".

We may also write

and or and

which is

and and and

The whole is the sum of the parts

WXXXXX

WXXXXX

YZZZZZ

YZZZZZ

YZZZZZ

which is the 3x multiplied by both in the 2nd brackets and 5 by both in the 2nd brackets.