Answer:
The answer is actually <em>CD, GH, and AB</em>. I got it incorrect from the answer above. This is for people in the future who are looking for answers and don't get messed up over that guy.
Step-by-step explanation:
I just took the test and got the answer wrong. Correct answer above. (Checkmarks next to answer means its correct)
Answer:
C
Step-by-step explanation:
Answer: f(x) = (x + 3)(x – 7)
Step-by-step explanation: Use "standard form" of the function and insert values given: vertex (2,-25) intercept point (7,0)
f(x) = a(x-h)² + k from vertex, h is 2 y is -25 from intercept, x is 7 f(x) is 0
to find a, 0 = a(7-2)² +(-25) 0 = a(7-2)² -25 add 25 to both sides
25 = a(5)² 25 = 25a 25/25 = a 1=a (seems useless but verifies implied "a"coefficient is 1)
f(x) = a(x-h)² + k solve to get the quadratic form
f(x) = (x-2)² -25 (x - 2)² is x² -4x +4
f(x) = x² -4x +4 -25 simplify
f(x) = x² -4x - 21 then factor
f(x) = (x + 3)(x - 7)
To solve for the inverse
1. replace f(x) with y
2. switch all x with y and y with x
3. solve for y
4. replace y with
replace
switch
solve
![2yx+x=y+1 [tex]x-1=y-2xy](https://tex.z-dn.net/?f=2yx%2Bx%3Dy%2B1%20%5Btex%5Dx-1%3Dy-2xy)
replace
