Evaluate f(-12) given f(x) = -21x - 12

A function is like a machine that gives an output for a given input.
A function has an independent variable which is called the input of the function.
The output for a given input is called the dependent variable.

For Example

f ( x ) = x + 3

x = independent variable

f ( x ) = Output for a given input

Here we have

[tex]f(x)=-21x-12\\Put\ x=-21\\\therefore f(-12) = -21\times -12 - 12\\\therefore f(-12) = 252 - 12\\\therefore f(-12) = 240[/tex]

Therefore f(-12) = 240

mintuchoubay mintuchoubay · Answer 2 · 2019-12-09T11:22:05+01:00

Answer for f(-12) = 240 for function f(x) = -21x -12

Step-by-step explanation:

Theory: f(x) is the" Function " and defined as a relation between the set of input values and a respective set of output values. set of input values is term as " Domain " and a respective set of output values is term as " Range "

In given question, f(x) = -21x -12

Note: Question didn't mention the domain so that, we can take it as Real numbers.

To find value of f( -12 )

Replacing value of x with (-12) in f(x)

we get,

f(-12) = -21(-12) -12

f(-12) = 240.