show that 3 is the zero of the polynomial x³ -8x²+8x+21
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show that 3 is the zero of the polynomial x³ -8x²+8x+21
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Step-by-step explanation:
x^3 - 8x^2 + 8x + 21
put x=3 in equation
(3)^3 - 8(3)^2 + 8(3) + 21
27 - 8(9) + 24 +21
27-72+24+21
0
hence we proved that 3 is the zero of given polynomial.
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