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'Factorise' and 'factorise fully'

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Reply 20

Mr M

Study Forum Helper

Original post by rtyi

So if i was to fully factorise
60-20m
It would be
20(3-m)?

yes

Reply 21

.JJ.

what about with cubics

say x^3 - 9x for example

I would factorise it to x(x^2 - 9) but i feel like I'm wrong

Reply 22

Notnek

Original post by .JJ.

what about with cubics

say x^3 - 9x for example

I would factorise it to x(x^2 - 9) but i feel like I'm wrong

That would be factorised but not fully factorised since x^2 - 9 can be factorised more. Next time please start a new thread instead of replying to 7 year old threads!

Reply 23

leeyo

thanks I've always gotten these mixed up but i'm finally starting to make sense of it :smile:

Reply 24

Denver1

Original post by Mr M

Fully factorise

2a^2 + 10a

These are factorised:

2(a^2 + 5a)

a(2a+10)

This is fully factorised:

2a(a + 5)

Spot the difference?

I understand this now... thank u so much!!

Reply 25

Denver1

Original post by sksksk1

I'm so bad with this side of maths! I do see the difference, but how do you know which is factorised and which is fully factorised? sorry, probably a stupid question to you, but it really just goes right over my head along with quadratics and simultaneous equations! ahh.