Question

Let f(x) = 12 over the quantity of 4 x + 2. Find f(-1).

Answer 1

-6

-2

2

6

Answer 2

@kirbykirby @wyattp17 @Jacob_Junior

Answer 3

@PaulaLovesSchool13

Answer 4

.....

Answer 5

Reminder: I am not the best in math XD

Answer 6

to get f(-1), just plug in x=-1 in f(x)!

Answer 7

is it -6

Answer 8

or 6

Answer 9

\(\large f(x) = \dfrac{12}{4x+2} \\ \Large f(-1) = \dfrac{12}{4(-1)+2} = ... ?\)

Answer 10

yes!
-6 is correct :)

Answer 11

Let f(x) = 2x - 6. Solve f-1(x) when x = 2.

-5

4

-2

7

Answer 12

is it b

Answer 13

2x-6 = 2
YES! answer is 4, good! :)

Answer 14

Let f(x) = x + 8 and g(x) = x2 - 6x - 7. Find f(g(2)).

-7

-3

10

33

Answer 15

here i dont know what to do

Answer 16

find g(2) first, as usual

Answer 17

plug in x=2 in g(x) to get g(2)

Answer 18

-15 + 8

Answer 19

excellent work!

Answer 20

-7 is correct :)

Answer 21

can u help me with two more

Answer 22

Let f(x) = x - 2 and g(x) = x2 - 7x - 9. Find f(g(-1)).

-21

-3

3

21

Answer 23

sure :)

Answer 24

whats g(-1) ?
plug in x=-1 in g(x)

Answer 25

Let f(x) = x2 - 81. Find f-1(x).

±square root of the quantity x plus 81

9square root of x

1 over quantity x squared minus 81

x squared over 81

Answer 26

the llast oone i think its c

Answer 27

and the 1 -21

Answer 28

am i right

Answer 29

good explaining Taylor! Wear this medal :)

Answer 30

@hartnn

Answer 31

f(g(-1)) is actually -3.
how u got -21 ?

Answer 32

i just did 7times 3

Answer 33

g(-1) = 1 - 7(-1) - 9 = 1+7-9 = -1

f(x) = x - 2 , f(-1) = -1-2 =-3

Answer 34

y = x^2 - 81

try to isolate x from here, that will be your inverse function

Answer 35

- 81 times 2

Answer 36

no...like this :
\(y = x^2 -81 \\ y+81 =x^2 \\x = \pm \sqrt {y+81} \)

Answer 37

so your inverse function will be
square root of (x+81)

Answer 38

"±square root of the quantity x plus 81"