show that 3 is a zero of the polynomial x3-8x2+8x+21
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harshi4221:
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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.
Hope it helps
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.
Hope it helps
thank
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