show that 5 is the zero of polynomial 2x^3-7x^4-16x+5
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x=5
F(x)=2x^3-7x^2-16x+5
F(5)=2×5^3-7×5^2-16×5+5
=250-70-80+5
=105
F(x)=2x^3-7x^2-16x+5
F(5)=2×5^3-7×5^2-16×5+5
=250-70-80+5
=105
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