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For each of the following conjectures, determine what method of proof or disproof would be the most efficient or elegant method for proving the statement.

For each of the following conjectures, determine what method of proof or
disproof would be the most efficient or elegant method for proving the statement. You need not write a formal proof (though you can) but you must answer in a structured paragraph format, detailing your reasoning, mathematical principles used, and any necessary calculations.
a) If x is a positive integer and x2= x, then x =x.
b) If x is an positive integer and (x +1)3= x3+2x2+2x +1, then x2=x.
c) If n >=0, then log2 n >= n
100 for all n

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