which two numbers add to get -1 and multiply to get -2

  • 0 votes

The original question is 2x^2 - x - 1 = 0

Posted Tue 31st May, 2011 @ 22:29 by Lamise Hassan

3 Answers

  • 2 votes

(2x+1)(x-1)=0
2x^2-2x+x-1=0
2x^2-x-1=0
so x=-0.5 or x=1
Hope this helps :)

Answered Wed 1st June, 2011 @ 00:14 by Joe Brown
  • 0 votes

I've got 1 and -1

Answered Tue 31st May, 2011 @ 23:05 by Al
  • 0 votes

Yaay x= -0.5 and x=1 are correct! (answer scheme), saves embarrassment from my teacher, thanks :)

Answered Wed 1st June, 2011 @ 08:16 by Lamise Hassan