The value of the function instances as required in the task content; f(-1) is; 5.
What is the value of the function instance; f(-1) according to the function definition?
It follows from the task content that the value of the function instance; f(-1) is to be evaluated by means of the given function definition.
Since the function f(x) = x² -4x according to the task content, it follows that the value of f(-1) can be evaluated as;
f(-1) = (-1)² -4(-1)
= 1+4
= 5.
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