d)
-(3c-2)(c-1)-c(c-2)=-(3c²-3c-2c+2)-c²+2c=-3c²+5c-2-c²+2c=-4c²+7c-2
e)
2(3a²-1)-(a+2)(a+2)=6a²-2-(a²+4a+4)=6a²-2-a²-4a-4=5a²-4a-6
f)
5x²(x²+1)-(x²-2)(x²+3)=5x⁴+5x²-(x⁴+3x²-2x²-6)=5x⁴+5x²-x⁴-x²+6=4x⁴+4x²+6
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d)
-(3c-2)(c-1)-c(c-2)=-(3c²-3c-2c+2)-c²+2c=-3c²+5c-2-c²+2c=-4c²+7c-2
e)
2(3a²-1)-(a+2)(a+2)=6a²-2-(a²+4a+4)=6a²-2-a²-4a-4=5a²-4a-6
f)
5x²(x²+1)-(x²-2)(x²+3)=5x⁴+5x²-(x⁴+3x²-2x²-6)=5x⁴+5x²-x⁴-x²+6=4x⁴+4x²+6