shaleiah
  • shaleiah
Please help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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shaleiah
  • shaleiah
@Nnesha Did I graph these 3 points, right?
Nnesha
  • Nnesha
hmm \[\huge\rm y=a(x-h)^2+k\] vertex form of parabola where (h,k) is the vertex point and find x and y intercepts
Nnesha
  • Nnesha
x-intercept is a point where line intersect x-axis when y=0 so substitute y for 0 to find x intercept y-intercept is a point where line intersect y-axis when x=0 so substitute x for y to find y-intercept

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shaleiah
  • shaleiah
The vertex is (4,1)
Nnesha
  • Nnesha
right
shaleiah
  • shaleiah
what are the next steps?
Nnesha
  • Nnesha
alright and bec a is negative in the question so we would get max point (graph opens down)
Nnesha
  • Nnesha
so max would be at ((4,1) |dw:1443814926678:dw|
Nnesha
  • Nnesha
now find x intercept
Nnesha
  • Nnesha
hmm highest degree is 2 so you should get 2 xintercepts 4 isn't correct
shaleiah
  • shaleiah
okay, (9,7)
Nnesha
  • Nnesha
hmm how did you get that ?
shaleiah
  • shaleiah
I graphed it on my calculator
Nnesha
  • Nnesha
hmm make sure you typed the correct equation
shaleiah
  • shaleiah
Alright, I got x=0 and y=-63
Nnesha
  • Nnesha
yeah that's y-intercept now substitute y for 0 to find x-intercept
Nnesha
  • Nnesha
let me know if u don't know how to solve for x
shaleiah
  • shaleiah
(0,-1)
shaleiah
  • shaleiah
help
Nnesha
  • Nnesha
alright wait a sec
Nnesha
  • Nnesha
\[\huge\rm 0=-4(x-4)^2+1\] do you know the quadratic formula ?
Nnesha
  • Nnesha
(x-4)^2 is same as (x-4)(x-4) foil it
Nnesha
  • Nnesha
familiar with the foil method ?
Nnesha
  • Nnesha
hmmm better use calculator instead google i didn't get 16
Nnesha
  • Nnesha
make sure you are looking at the right question
shaleiah
  • shaleiah
(0,16)
Nnesha
  • Nnesha
i have no idea how u got that please show some work we need x intercepts when y =0
shaleiah
  • shaleiah
-sighs- I typed it in my calculator. (x-4)^2 and graphed, it showed x=0 and y=16
Nnesha
  • Nnesha
hmm well ur equations is -4(x-4)^2 +1 that's what u should type into the calculator
shaleiah
  • shaleiah
lots of step lol
shaleiah
  • shaleiah
steps*
Nnesha
  • Nnesha
will if you want to solve by hand to find x-itnercepts then yes there are lots of steps if you want to use calculator then there are none
Nnesha
  • Nnesha
well* ...
shaleiah
  • shaleiah
Alright, I typed it in. Graphed. X=0
Nnesha
  • Nnesha
lol i was about to post ur question on others thread :D
shaleiah
  • shaleiah
I'm sorry, I am not that good at math, I'm barely on an intermediate level.
Nnesha
  • Nnesha
or here is another way to graph x-coordinate of vertex is 4 right so draw a table |dw:1443819080897:dw| now substitute those points to find y coordinate
Nnesha
  • Nnesha
no i have so man tabs open so that's why
Nnesha
  • Nnesha
many*
Nnesha
  • Nnesha
do you understand that ?
Nnesha
  • Nnesha
don't need to find x-intercepts just substitute x for the points in the table that's it
shaleiah
  • shaleiah
Okay
shaleiah
  • shaleiah
@Nnesha
Nnesha
  • Nnesha
vertex is max point min = minimum max = maximum |dw:1443820566646:dw|
Nnesha
  • Nnesha
|dw:1443820718145:dw| if the vertex is at (4,1) that would be the maxx point
Nnesha
  • Nnesha
|dw:1443820739973:dw| this point should be the max that's why to find other two points we should go up 2 and down 4 from the x-coordinate of the vertex
Nnesha
  • Nnesha
|dw:1443820778704:dw| use this table substitute x for its value from the table then solve for y