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FACTORISING, which type do i use, when to find value of x and when to not?? watch

1. You're correct! Looking back through all my wokring i seemed to have made the stupid mistake of 3x x 8=28x instead of 24x ! Thanks for your help everyone!
(Original post by Notnek)
You should get 0 = 14x^2 - 41x - 3.

Have another go and please post all your working if you get stuck. Also, for future questions please always post the original question and your full attempt.
2. Okay we have:

As others have stated, we have methods of finding values of x including:

- Completing the square.

However, as we have some large values we can try inspection.

-------------------------------------------------------------------------------------------------------------------

For inspection, we could try

We need:

- ln = C

- lm +kn = B,

- km = A.

----------------------------------------------------------------------------------------------

Try: .

We need:

- ab = -3, (a=-1 and b = 3 ? or a=1 and b = -3 ? or a=3 and b=-1 ? ...)

- a + 14b = -41.

Are you able to carry on from here?
3. Another method you can try (learned this here on TSR) is:

Multiply by the coefficient of :

Let :

.

Then factorise (remembering to divide by 14 at the end).

Are you able to carry on with this?

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Updated: November 4, 2017
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