Factorising quadratics is one of those things that always comes up. Unfortunately it is also one of those things that students find hard 🙁

With that in mind I’ve put a load of practice questions on here that if you answer and send to me as a comment, I’ll mark and let you know if you’ve got it 🙂 or where you went wrong 🙂

Here goes…

**Factorise**

**1)** x² + 7x + 10

**2)** k² + 10k + 21

**3)** g² – 7g + 10

**4)** x² – 8x + 15

**5)** y² + 5y – 14

**6)** e² + 3e – 18

**7)** m² – 5m – 6

**8)** d² – 2m – 8

Simples! Well, not actually, but if you need help that’s what I’m here for. Or, if you’d prefer, here’s the mymaths link:

http://www.mymaths.co.uk/tasks/library/loadLesson.asp?title=factorising/factorisemovie&taskID=1157

(x+5)(x+2)

Correct!(k+3)(k+7)

Correct!(g-5)(g+2) =

g²-3g-10 so problem here with negatives(x-5)(x+3) =

x²-2x-15 so same problem here(y-7)(y-2) =

x²-9x+14Good work in todays lesson and nice one for trying it too, just think you need that extra bit of practice to iron out mistakes with the negative numbers.

Remember – neg x neg = positive

– pos x neg = negative

– and you can always expand your answer to check it.