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=(x-3)(x-3)
=x²-3x-3x+9
=x²-6x+9
2). (x-3)³
=(x-3)² (x-3)
=x²-6x+9 (x-3)
=x³-6x²+9x-3x²+18x-27
=x³-9x²+27x-27
2. (x-3)³= x³-9x-27