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Question

Verify whether 2 is a zero of the polynomial x3+4x23x18 or not?

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Solution

Let,
f(x)=x3+4x23x18

If 2 is a zero, then f(2) must be equal to 0.

So,
f(2)=23+4(2)23(2)18
=8+16618
=2424
=0

Hence, 2 is a zero of the polynomial.

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