non-calc exam question help?

  • 0 votes

hey, i've been going through an exam paper but i can't solve the last question!:

solve the simultaneous equations - y=x(squared) -3x and y=2x-6

i got up to the factorization bit i can't find any numbers that fit in with it and i can't use the quadratic formula because its a non-calc paper! 

any help? :)

Posted Sat 28th May, 2011 @ 15:38 by Kelly:)

4 Answers

  • 0 votes

i know but it's a non-calc paper so i wouldn't be able to do that in the actual exam!

Answered Sat 28th May, 2011 @ 16:00 by Kelly:)
  • 0 votes

2x-6=x^2-3x

x^2-5x+6=0

x^2-2x-3x+6=0

x(x-2)-3(x-2)=0

(x-3)(x-2)=0

x= 3 or 2

Answered Sat 28th May, 2011 @ 17:04 by N. M
  • 0 votes

thank you so much!! :)

Answered Sat 28th May, 2011 @ 21:33 by Kelly:)
  • -3 votes

you could use the quadratic formula to find out what x equals!

Answered Sat 28th May, 2011 @ 15:56 by Emily