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=(3a³+15a²-20a-25)-(12a²-8a+15a-10)
=3a³+15a²-20a-25-12a²+8a-15a+10
=3a³+15a²-12a²-20a+8a-15a-25+10
=3a³+3a²-27a-10
b.2(2a+b)²+(a-2b)²
=2(4a²+4ab+b²)+(a²-4ab+4b²)
=8a²+a²+8ab-4ab+b²+4b²
=9a²+4ab+5b²