Solution
we have given that
$$x - 3$$ = 0 so we get x = 3 put the value of x in the following equation
$$x^4 - 2x^3 + 3x^2 - mx + 3$$ = 0
3^4 - 2$$\times{3^3}$$ + 3$$\times{3^2}$$ - m$$\times{3}$$ + 3 = 0
m$$\times{3}$$ = 57
m = 19 answer
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