For polynomial p(x) ,

If p(a) = 0

Then x = a is the zero of polynomial

So, to find zero,

We put p(x) = 0

And then find the value of x

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Example
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:

p(x) = x + 30

Putting p(x) = 0

x + 30 = 0

x = –30

So, x = −30 is a zero of polynomial p(x)