It means the value of the function equals zero when the argument is 4.
For example:
f(x)=x-4
f(4)=4-4=0
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zero you dubass
The zero of a function is a point where the function evaluates to zero. If you express "y" as a function of "x", i.e. y = f(x), then for a zero of the function, the y-coordinate is 0. In other words, the corresponding point is on the x-axis.
If you meant x + 5 = 4 then the multiplicity is 1.
a zero matrix,zero of a function and a zero slope
zero