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Aleksandr [31]
3 years ago
11

If f(x) = 3x2 - x, find f(-2). 10 14 38

Mathematics
2 answers:
pav-90 [236]3 years ago
8 0
'Ello. 

Just plug in the values.
 
f(-2) = 3(-2)^2 - (-2) {Equation}
f(-2) = 3(4) - (-2) {Multiply}
f(-2) = 12 - (-2) {The signs become a positive; add}
f(-2) = 14 {Answer}

You're welcome. 
mojhsa [17]3 years ago
6 0

f(x) = 3x^2-x

F(-2)

 replace x with -2

3(-2)^2 - -2 =

3*4 +2 = 14

 Answer is 14


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goldfiish [28.3K]

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Step-by-step explanation: First you distribute the 12 to (10-x). That then gives you 15x+120-12x=141. Now you combine like terms. So you do 15x-12x=3x. Your new equation now is 3x+120=141. Subtract 120 from 141 and mark it out. That leaves you with 3x=21. Divide both sides by 3. Your final answer is x=7.

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ollegr [7]

Step-by-step explanation:

Let's call L the length and W the width.  The length is 10 feet longer than the width, so:

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The area is the length times width, so:

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Answer:

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Step-by-step explanation:

In the function f(x) = y

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