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Ugh Math Help?

1. Determine whether the following equations have a solution or not? Justify your answer.

a) x2 + 3x - 15 = 0
b) x2 + x + 4 = 0
c) x2 – 4x - 7 = 0
d) x2 – 8x + 16 = 0
e) 2x2 - 3x + 7 = 0
f) x2 – 4x - 77 = 0
g) 3x2 - 7x + 6 = 0
h) 4x2 + 16x + 16 = 0


2. If x = -3 and x = 4, then form a quadratic equation.


3. What type of solution do you get for quadratic equations where D < 0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solution of the equation.


4. Create a real-life situation that fits into the equation (x + 3)(x - 5) = 0 and express the situation as the same equation.

Answer Question
 
Anonymous

Asked by Anonymous at 4:55 PM on Feb. 6, 2009 in Money & Work

Answers (6)
  • Im sorry I cant really help you. Like you I normally ask for help with math too. Im horrible at it. But im going to look in my textbook for you with these problems and maybe i can help. If not I hope someone else can help you!
    haileysmom15

    Answer by haileysmom15 at 4:58 PM on Feb. 6, 2009

  • ahhh...im sorry i tried but i was never good at math either. there should be answers in the back of the math book-at least they were there when i was in school
    SThompson21

    Answer by SThompson21 at 4:58 PM on Feb. 6, 2009

  • a) x2 + 3x - 15 = 0
    x= 3 (Yes it does have a solution)

    b) x2 + x + 4 = 0
    x= -4/3 (Yes it does have a solution)

    c) 2x + -4x + - 7 = 0
    -2x = 7
    x = -3.5 (Yes it does have a solution)

    d) x2 – 8x + 16 = 0
    x= 8/3 (Yes it does have a solution)

    e) 2x2 - 3x + 7 = 0
    x = -7 (Yes it does have a solution)

    f) x2 – 4x - 77 = 0
    x = -38.5 (Yes it does have a solution)

    g) 3x2 - 7x + 6 = 0
    x=6 (Yes there is a solution)

    h) 4x2 + 16x + 16 = 0
    x= -2/3 (Yes there is a solution)
    Erica_Smerica

    Answer by Erica_Smerica at 8:30 PM on Feb. 6, 2009

  • I'm sorry I can't remember the other stuff so I can't help you with it :(
    Erica_Smerica

    Answer by Erica_Smerica at 8:30 PM on Feb. 6, 2009

  • Perhaps you should read your book some more and figure it out if you are taking a class. I am not being a snot, I am just saying that if this is for the before mentioned on-line class--it is cheating:-)
    Anonymous

    Answer by Anonymous at 11:50 PM on Feb. 6, 2009

  • Im sorry but if i had some hard questions that i couldnt figure out, believe me, i would be on here asking as well :) i have no idea though, i am horrible at math
    camtri3

    Answer by camtri3 at 10:02 PM on Feb. 7, 2009

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