Question

f(x)=3x^2+2x-4 find the function? how will I solve it?

Answer 1

split the middle term

Answer 2

how to solve it? can you do the first step??

Answer 3

do I have to put the value of x?

Answer 4

how it is to prove its a function

Answer 5

no srry
it can be done by quadratic formula

Answer 6

3x^2-2x-4=0
9x-2-2x-4=0
+2x +2x
11x-2-4=0
+2 +2
11x-4=0
+4 +4
11x=4
------ ------
11 11

x= 4
hope u got it

Answer 7

but I have given the value of x

Answer 8

so wat we have to find ??

Answer 9

I have given x=0 . x=1 , x=-1 , x=-x ? I am so confused . Do I have to put all the values

Answer 10

first of all u tell me u r in which class ?

Answer 11

I am in algebra and trignomerty

Answer 12

ok then u have to put all the values of x

Answer 13

plz give medals

Answer 14

thanxx.

Answer 15

-f(x)

Answer 16

so there are 6 values of x .so I have to put it six times?

Answer 17

and solve it

Answer 18

yess
you have to do it
its easy, it will take hardly 10 minutes

Answer 19

what to do after finding the answerS? make a graph?

Answer 20

is it given in the question to make a graph ???

Answer 21

f(-1)=3x^2-2x-4

Answer 22

yes u have to do it like this

Answer 23

but put the values of x also in equation

Answer 24

I did

Answer 25

ok

Answer 26

thats it

Answer 27

f(x)=3x^2+2x-4

is shorthand f(x) is a number that depends on what x is. change x, and you get a different f(x)

to find f(x) when x=0, f(0) you replace x in the definition and do the arithmetic
f(0)= 3*0^2 + 2*0-4 (replace x with 0)
0^2 means 0*0 which is 0. 3*0 is 0.
the 2nd term 2*0 is 0
so f(0)= 0+0-4= -4
(0,-4) is a point on this curve. (if you want to plot it)

do the same for f(1):

Answer 28

when x=1 then 5, -4 correct

Answer 29

when x=1 then f(1)= 3*1*1+2*1-4 = 3+2-4
that simplifies to 5-4= 1
so f(1)=1
(1,1) is another pair

Answer 30

try f(-1)

Answer 31

when x is -x>

Answer 32

sorry when x is -x?

Answer 33

try f(-1)

Answer 34

that is -1, -3

Answer 35

when x is -x?

Answer 36

3(-1)^2+2(-1)-4

Answer 37

3-2-4

Answer 38

and 3-2-4 is -3 Yes. so I take that back. You are correct.

x = -x is only true for x=0 0=-0

Answer 39

they want you to put -x into the equation
f(x)= 3x^2 + 2x -4

so replace x with -x:
f(-x)= 3*(-x)*(-x)+ 2*(-x) -4
f(-x)= 3x^2 -2x -4

Answer 40

Any more ?

Answer 41

after finding all the values do we have to make a graph or no?

Answer 42

It depends on what the question is.
Your function is a quadratic, representing a parabola.

Answer 43

find function. Thats my question

Answer 44

3x^2-2x-4 is the answer or do I have to solve more?

Answer 45

f(x)= 3x^2-2x-4
is a function. Without more context, I can't give any more insight.
If you want a plot, you can use the points you found.
Check against wolfram:
http://www.wolframalpha.com/input/?i=f%28x%29%3D3x%5E2%2B2x-4+

Answer 46

so is this the answer?

Answer 47

Does this question come with a chapter? Did they show an example?
If someone asked me "find the function" and showed me
f(x)= 3x^2-2x-4

I would say that is a parabola with a minimum value of -13/3 at x= -1/3
But if I saw what you were studying, I might answer differently.

Answer 48

I am looking in the book and yes the question ends here in examples .

Answer 49

can you figure out what they want?