Question

NEED HELP! THE QUESTION IS BELOW:)

Answer 1

Which equation matches the graph shown below?
y = 8x² + 2x – 5
y = 8x² + 2x + 5
y = 2x² + 8x + 5
y = 2x² + 8x – 5

Answer 2

http://www.wolframalpha.com/input/?i=factor+2x%C2%B2+%2B+8x+%E2%80%93+5

Answer 3

when you put x=0 you will get y=-5 so you two choices

Answer 4

Just 5 minutes

Answer 5

you need to use discrimanant

Answer 6

Sorry, kept you waiting

Answer 7

its cool

Answer 8

you cannot solve by looking at the graph, because x-intercets arent clear or exact value..

Answer 9

this is the answer 2x² + 8x – 5

Answer 10

thanks..

Answer 11

We are given 4 options
Let's see the graph , when x =0 y is around -5 so Let's put x =0 in each and check
-5
5
5
-5
either it's a or d

Answer 12

here is y=0 x values..
http://www.wolframalpha.com/input/?i=solve+2x%C2%B2+%2B+8x+%E2%80%93+5%3D0

Answer 13

Now Let's write this in vertex form
A parabola with vertex h, k is given as
\[y=a(x-h)^2+k\]
we have
option a
y=8x^2+2x-5
Let's try to convert this in standard form
\[y=8(x^2+x/4+1/64)-1/8-5\]
or
\[y=8(x+1/8)^2-41/8\]
so here vertex is -1/8, -41/8
Now option d
\[y=2x^2+8x-5\]
or
\[y=2(x^2+4x+4)-8-5\]
or
\[y=2(x+2)^2-13\]
here vertex is (-2, -13)
In our graph also the vertex is (-2, -13) so
option D is the answer