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2(3x-y)²-3(x-2y)(x+2y)+12xy=2(9x²-6xy+y²)-3(x²-4y²)+12xy=18x²-12xy+2y²-3x²+12y²+12xy=15x²+14y²=15*3²+14*(-1)²=15*9+14*1=135+14=149
b) a=2 b=√2
(2a-3b)²-(2a+b)(2a-b)-4b(2b-3a)+a= 4a-12ab+9b²-4a²-b²-8b²+12ab+a= 5a+b²-4a²=5*2+(√2)²-4*2²= 10+2-4*4= 12-16= -4