3 then Fdt is If F=(3t^2+4t)i+ (2t-5) j+4t^3 k 42i-j+80k I O 42i + 2j-80k .II O 421-21+80k.I O

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.