The value of f(4) is -4.3.
The function is a relation between two different sets X and set Y which are in one-one or many-one relation. Here set X is called as the domain and set Y is called as the codomain.
For example: f(x)=3x+9
To get the value of the function at any point of x, we have to put the number in the function to get its function value.
For example the value of f(x) in above function at x=a will be f(a)=3a+9
Similarly given function in the question
to get the value of f(x) at x=4 put the value of x in the function,
⇒
⇒f(x)=-4.3
Therefore the value of f(4) is -4.3.
Learn more about Function
here: brainly.com/question/4025726
#SPJ10