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# How do I do this Factorising Question? watch

1. Sorry, quesion says:

Fins p and q such that:

f(x) = (x-3)(x^2 + px + q)

Then factorise fully f(x)
Sorry, quesion says:

Fins p and q such that:

f(x) = (x-3)(x^2 + px + q)

Then factorise fully f(x)
i don't understand tho, what is f(x) supposed to be equal to other than the expression you gave? cus you can use any old value for p and q

in other words, post the full question please
Sorry, quesion says:

Fins p and q such that:

f(x) = (x-3)(x^2 + px + q)

Then factorise fully f(x)
What's the full expression? There's not enough info in this post.
4. You should have a cubic that goes with this. Factorise the cubic by equating coefficients. You can then find p and q and factorise the quadratic. You should get something like f(x)=(x-3)(x+r)(x+s) if the quadratic can be factorised.
5. (Original post by JemmaSimmons)
You should have a cubic that goes with this. Factorise the cubic by equating coefficients. You can then find p and q and factorise the quadratic. You should get something like f(x)=(x-3)(x+r)(x+s) if the quadratic can be factorised.
Yes I just realised haha. I've worked it out now but the cubic was x^2 +3x-28. Took me forever! Thank you.
Yes I just realised haha. I've worked it out now but the cubic was x^2 +3x-28. Took me forever! Thank you.
No problem, congrats on cracking it!
7. (Original post by JemmaSimmons)
No problem, congrats on cracking it!
Thank you!

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