Question

Using complete sentences, explain how to find the zeros of the function f(x) = 2x^3-9x+3.

Answer 1

well I think you factor out the equation and use the ( ? ) ( ? ) to solve for x, whatever the x's are will be your zeros

Answer 2

what is the (?)(?)

Answer 3

factorize first

Answer 4

how

Answer 5

Start by finding two numbers, a and c, such that:

a + c = -9
ac = (2)(3)

Answer 6

Or you can just graph the function and observe where it crosses the x-axis

Answer 7

Yet another alternative is to complete the square. If you want to do that, you can start by setting f(x) to 0.

Answer 8

2x^2 - 9x + 3 = 0

Answer 9

One of the above are methods students use to find the zeroes.

Answer 10

Okay, that's a good start.

Answer 11

i cant seem to factor the 2x^2 - 9x + 3 = 0

Answer 12

That's because it is not factorable by methods you normally use.

Answer 13

If the quadratic function isn't factorable, you usually use the quadratic formula to find the zeros.

Answer 14

\(\large x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\)

Answer 15

im doing that right now

Answer 16

Great :D

Answer 17

\[9+√57/4 \]

Answer 18

\[9-√57/4\]

Answer 19

And that's still simplifyable

Answer 20

ohh

Answer 21

Did you figure out your mistake while using the formula?

Answer 22

nope

Answer 23

looks like I'm the one that made the mistake.

Answer 24

Good job

Answer 25

hahaha thanks!