Question

PLEASE HELP ME! How do I test each answer? I tried two different ways.

Answer 1

what is the value of the function when

x= 2 ?
x=14 ?
x= 7 ?
x=-1 ?

Answer 2

or, it may give you the range and so we are trying to match what x value gets us to that range value

Answer 3

f(14) = 223, so im pretty sure its the second idea

14 = some value of x

Answer 4

So I should try plugging in those numbers, Whatever comes up I drag it to?

Answer 5

yeah

Answer 6

I tried doing 14=2^2+2(2)-1 and so on but none of them equaled 14...

Answer 7

Oh wait 3 works huh...

Answer 8

f(x)+1 = x^2 + 2x

f(x)+1 = x(x+2)
-----------------

3 = x(x+2) , 1*3

15 = x(x+2), 3*5

8 = x(x+2), 2*4

0 = x(x+2), 0*2

Answer 9

0 = -2*0 as well so we shouldnt fret over that one lol

Answer 10

-3(-1) = 3 as well .... so its more of an art for this approach

Answer 11

I must be doing something wrong here, I'm trying this.
2=2^2+2(-2)-1 WRONG
2=-2^2+2(2)-1 WRONG
2=-3^2+2(-3)-1 WRONG

Answer 12

your taking the long way about ....

Answer 13

I don't mind the long way, I find it more simple. But its not even working

Answer 14

x(x+2) - 1
2 4
8 -1 = 7


x(x+2) - 1
-2 0
0 -1 = -1


x(x+2) - 1
3 5
15 -1 = 14



x(x+2) - 1
-3 -1
3 -1 = 2

Answer 15

Where are you getting the numbers below the equation

Answer 16

x^2 + 2x - 1
2 2
4 + 4 - 1 = 7


x^2 + 2x - 1
-2 -2
4 - 4 - 1 = -1

Answer 17

im inserting a domain value, and defining the term as a number

Answer 18

x^2 + 2x - 1
3 3
9 +6 -1 = 14



x^2 + 2x - 1
-3 -3
9 -6 - 1 = 2

Answer 19

I still don't see nor get how youre going about on matches the two numbers up

Answer 20

Do it easier, even if it is longer.

Answer 21

i did it short ways and long way, we are trying to match up

x = 2, -2, 3, -3

f(x) = 2, 14, 7, -1

which value of x gets us the corresponding f(x) value?

Answer 22

What do I plug in where to test if its right

Answer 23

x^2 + 2x - 1 let x = 2
2 2

define the terms

4 +4 - 1

what does the equal? 7

when x=2, f(2) = 7

Answer 24

so -2=-1..?

Answer 25

Right?

Answer 26

x^2 + 2x - 1 let x = -2
-2 -2

define the terms

4 -4 - 1

what does the equal? -1

when x=-2, f(-2) = -1

yes

Answer 27

Am I right with them all?

Answer 28

you should be able to determine if they are right or not, its just arithmetic.

Answer 29

x^2 + 2x - 1 let x = 2
2 2

define the terms

4 +4 - 1

what does the equal? 7

when x=2, f(2) = 7

I got that
(:

Answer 30

weve covered them all, id say you ordered them correctly

Answer 31

Yeah I just double checked! Thanks

Answer 32

The range of the function f(x) = x + 5 is {7, 9}. What is the function’s domain?
{2, 4}
{-2, -4}
{12, 14}
{-12, -14}
{0, 5}

Answer 33

Same concept, but does f(x)= 7 & 9 or the answers? @amistre64

Answer 34

7&9 right?