Question

plot the graph of y=2x2+7x-4?
Thanks before that :)

Answer 1

@sheldonEinstein

Answer 2

you should be able to determine at most, 4 points that will help define this in a unique manner and make a sketch of the graph.

Answer 3

y intercept

x intecepts (0, 1, or 2)

vertex

Answer 4

if the intent is to plot all the points, then you will simply need to make a table of values; which is very time consuming

Answer 5

amistre64: Can you help me to draw the graph?

Answer 6

yes, we would need to determine the points that i listed

Answer 7

when x=0, the y intercept (the value of y) is what?

Answer 8

@amistre64 can you help me to draw the graph?
and how about the vertex and y intercept

Answer 9

sorry, but the OpenStudy is playing tricks with my computer.

Answer 10

@amistre64 how about the value of vetex and y intercept?

Answer 11

y intercept is when x = 0

vertex uses the form -b/2a ; or simply find the center between the zeros

Answer 12

you can restructure the equation by "completing the square" to reform it into the vertex form; or simply use the -b/2a to define the y value

Answer 13

if you know the quadraticv formula, you can even pull off the zeros\[x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]

Answer 14

@amistre64 ok, thanks

Answer 15

youre welcome

if you want to check your graph sketch, the wolf is pretty good at it

Answer 16

http://www.wolframalpha.com/input/?i=2x2%2B7x-4

Answer 17

@SheldonEinstein