Question

how to sketch the function for y = -7x2(2 is supposed to be squared) - 12x+4

Answer 1

\[y=-7x^2-12x+4\]

Answer 2

yeah, thats it.

Answer 3

Find the x coordinate of the vertex by using x = -b/2a. Then plug that value in to find the y coordinate of the vertex.

Answer 4

\[x=\frac{12}{-14}=\frac{-6}{7}\]

Answer 5

how does x = to that ? i don't get where you got the 6 and 14 from ?

Answer 6

roots are -2 and 2/7

Answer 7

and it will intersect the y axis at +4

Answer 8

now you know where it will intersect the x axis and y axis. can you draw now?

Answer 9

\[y=-7(\frac{-6}{7})^2-12(\frac{-6}{7})+4=\frac{-36}{7}+\frac{72}{7}+4=\frac{64}{7}\]

Answer 10

its just a sketch :)

Answer 11

wouldn't it be 12/14 not -14 ?

Answer 12

Did you read what I wrote about the x coordinate of the vertex?