(11) 3X --
3.
If 2 is a zero of the polynomial p(x) = x3 - 2kx2 + kox - 1, find the value of k.
4. Show that 3 is a zero of the polynomial x3 - 8x2 + 8x + 21.
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X³-8x²+8x+21
Put x = 3 to know whether it is a zero of the polynomial.
= (3)³-8(3)²+8(3)+21
= 27-8(9)+24+21
= 27-72+24+21
= 72-72
= 0
Therefore,3 is a zero of the given polynomial.
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