SOLUTION: 1. What is the y-coordinate of the equation f(x)=3(x-1)(x+4) 2. Express the function f(x)=-5x^2+20x+2 in vertex form. a)state the maximum or minimum value. b)determine the int

Algebra ->  Graphs -> SOLUTION: 1. What is the y-coordinate of the equation f(x)=3(x-1)(x+4) 2. Express the function f(x)=-5x^2+20x+2 in vertex form. a)state the maximum or minimum value. b)determine the int      Log On


   

Question 821153: 1. What is the y-coordinate of the equation f(x)=3(x-1)(x+4)
2. Express the function f(x)=-5x^2+20x+2 in vertex form.
a)state the maximum or minimum value.
b)determine the intervals where the function is increasing or decreasing
c)determine the intervals where the function is positive or negative.

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
A little bit of help:

(1)
The y coordinate depends on what you choose for x. Did you want to ask about something other than, "y coordinate"? If you want the y-intercept, then this would be f(x) when x=0, which is f%280%29=3%280-1%29%280%2B4%29=3%28-1%29%284%29=highlight%28-12%29.

(2)
Complete The Square and adjust the form into y=a%28x-h%29%5E2%2Bk.
Start THIS way:
y=-5%28x%5E2-4x-2%2F5%29;
ADD and SUBTRACT the term, %28-4%2F2%29%5E2=4 INSIDE the parenthesized quadratic expression...
Can you do the rest?