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- Oct 28th 2008, 12:30 PM #1

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- Oct 2008
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## quadractics, help

**Quadratics Assignment HELP!**

Hello, im doing this quadratics math assingment, i have not been able to resolve the next three questions. Could someone please help me out? i would be extremely grateful

1. Consider the function, f(x)= -4x^2 -16x -7

a)Determine the y-intercept

b)Determine the vertex

c) Determine the x-intercepts

(When i tried this one i converted the stantard form to vertex form, but im not sure if i did it right, and then to get the x intercepts i tried the Australian method to convert it to factored form but i failed, so im all confused now)

2. Simplify the following expression:

√18 + √20 + √12 + √32

----- ---- ---- -----

√50 √45 √75 √18

(the thing infront of the numbers is the square root sign)

3. Determine the value(s) of K, such that the quadratic equation

0= x^2 + kx + k + 15

pleasee, help i need to understand how to resolve this

- Oct 28th 2008, 12:46 PM #2

- Oct 28th 2008, 12:52 PM #3