This is just notation so we can differentiated between multiple different functions
instead of saying
y=x + 4
we
say
f(x) = x + 4
This is because if we had two functions
y = x + 4
and
y = x - 6
it would get confusing to talk about them, so we use this notation to differentiate between theme easily
by making
f(x) = x + 4
and
g(x) = x - 6
we can now talk about them easily and avoid confusion.
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