*
a)
2a³-6a²+2a-6a³-1a=-4a³-6a²+a
=49a²-42ab+9b²+a²+8ab+16b²=50a²-34ab+25b²
=5(x²-5)=5x²-25
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a)
2a³-6a²+2a-6a³-1a=-4a³-6a²+a
=49a²-42ab+9b²+a²+8ab+16b²=50a²-34ab+25b²
=5(x²-5)=5x²-25