Question

if f(x) = 9 - 4/x + 1/, f(-5)

Answer 1

Just plug -5 in for x

Answer 2

\[f(-5) = 9 - \frac{ 4 }{ (-5) }+1\]

Answer 3

\[f(-5) = 9 + \frac{ 4 }{ 5 }+1\]

Answer 4

Do you understand?

Answer 5

i think so, what is the next step? @zeesbrat3

Answer 6

Add them all together

Answer 7

how do i do that when its a fraction? @zeesbrat3

Answer 8

Well there are two ways of doing it.
1. Find the decimal version of 4/5
2. Change the numbers so that they are in fraction form as well and add the numerators

Answer 9

The first way:
\[f(-5) = 9 + .8 +1\]

The second way:
\[f(-5) = \frac{ 45 }{ 5 } + \frac{ 4 }{ 5 } + \frac{ 5 }{ 5 }\]

Answer 10

that would make the answer 10.8 and that is not an option.

Answer 11

What are you options?

Answer 12

-15
-7
7
23

I think we are looking at this the wrong way

Answer 13

Are you sure the expression is f(x) = 9 + 4/x +1?

Answer 14

no. its \[if f(x) = 9 - 4|x + 1| find f(-5)\]

Answer 15

That would make a lot more sense

Answer 16

\[f(x) = 9 - 4\left| x +1\right|\]
\[f(-5) = 9 - 4\left| (-5) + 1) \right|\]
\[f(-5) = 9 -4\left| -4 \right|\]
\[f(-5) = 9 - 4(4)\]
\[f(-5) = 9 -16\]
\[f(-5) = -7\]

Answer 17

that makes sense

Answer 18

Does it, or are you just saying that? Feel free to ask questions if you have them.

Answer 19

Better check that you have copied this problem down correctly. You've written: f(x) = 9 - 4/x + 1/

Do you mean \[f(x)=9-\frac{ 4 }{ x } or \]

Answer 20

Better check that you have copied this problem down correctly. You've written: f(x) = 9 - 4/x + 1/

Do you mean \[f(x)=9-\frac{ 4 }{ x } + 1, ~or~\frac{ 9-4 }{ x+1 },~or~... ~?\]

Answer 21

Please use parentheses to indicate which work has to be done first (following order of operations rules).