1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help with maths question pls

  1. Sep 24, 2005 #1
    ok this is the question:

    f(x) = 6x2 + 12x + c where C is a constant.
    a) Given f(x) =0 has equal roots, find the value of C.

    so this what i did for this part:

    b2- 4ac = 0 (formula for discriminant)
    122-4(6xC) =0
    c=6 (is that right?)

    Now for the next part:
    b) Hence, solve f(x) = 0

    x=-1 x= -6/6 = -1

    I wasn't really sure what i was doing but i tried to work it out and this is what i did but i'm not sure if it's right. (i don't think it is!) Can somebody help please!
  2. jcsd
  3. Sep 24, 2005 #2


    User Avatar
    Homework Helper

    a) Correct.
    b) I would've used the quadratic formula. It's correct, though.
  4. Sep 24, 2005 #3
    really? wow i was convinced it was wrong, thanks!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Help with maths question pls