Question

Which of the following is the graph the function f(x) = 3x3 + 9x2 – 2x – 3 ?

Answer 1

Can some oone help Pleasee ?

Answer 2

notice that leading coefficient is positive (3)

Answer 3

having seen that, you can strike off two options immediatly, what wud be they ?

Answer 4

soo its between A or C ?

Answer 5

http://www.wolframalpha.com/input/?i=3x3+%E2%80%93+9x2+%E2%80%93+2x+%E2%80%93+3

Answer 6

last two options we can strike off cuz, as we go right, they are falling down

Answer 7

when leading coefficient is positive, the graph rises up as we go right

Answer 8

so it must be between A or B

Answer 9

sooo how should i make a decision.?

Answer 10

check y-intercept to decide between A and B

Answer 11

f(x) = 3x3 + 9x2 – 2x – 3

put x = 0

f(x) = ?

Answer 12

-3 ?

Answer 13

Yes, so it cuts y axis at negative side !

Answer 14

which one is it ?

Answer 15

so b ? since its on the negative ?

Answer 16

Yes ! good work :)

Answer 17

thank youu (:

Answer 18

np :)