Algebra

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Could someone verify if I got two answers to two problems right?

f(x)=x^2-9x+15 find x and y intercepts
-9+square root of 21/2,0
-9-square root of 21/2,0

x^2-x+3=0 solve and find x-intercepts
(1+square root of -11/2,0)
(-1-square root of -11/2,0)

  • Algebra -

    for ax^2 + bx + c = 0,
    x = (-b ± √(b^2 - 4ac) )/(2a)

    so for yours, for the x-intercepts
    x = (+9 ± √(81-4(1)(15))/2
    = (9 ± √21)/2

    for the y-intercept, let x=0
    f(0) = 0-9+15 = 15

    for the second:
    x-intercept: (1 + √-11)/2 , (you had 1 + √-11/2 ---> only the last term was divided by 2 )
    y-intercept : 3

  • Algebra -

    Hi
    I don't understand how you are getting the y intercept. I am so confused about which numbers are solutions, vertex, x-intercepts, y-intercepts etc.

    Can you write out an example of an equation and how you get each number from a formula. I have been in this class for nine weeks and with all the information I have at my disposal I still am confused.

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