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Verify that 1 is not a zero of the polynomial 4x4 – 3x3 + 2x2 – 5x + 1.

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Let p(x) = 4x4 – 3x3 + 2x2 – 5x + 1

Now

P(1) = 4(1)4 – 3(1)3 + 2(1)2 – 5(1) + 1 

= 4 – 3 + 2 – 5 + 1 = -1

p(1) ≠ 0

1 is not a zero of p(x).

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