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(3y-1)^2-(2y-5)(2y+5)-3y^2=
9y²-6y+1-(4y²-25)-3y²=
9y²-6y+1-4y²+25-3y²=
2y²-6y+26
b)
(4b^2+3)^2 -2(b-3)-(b-1)^2=
16b⁴+24b²+9-2b+6-(b²-2b+1)=
16b⁴+24b²+9-2b+6-b²+2b-1=
16b⁴+23b²+14
c)
2(2a+b)^2-(2b+a)^2=
2(4a²+4ab+b²)-(2b²+4ab+a²)=
8a²+8ab+2b²-2b²-4ab-a²=
7a²+4ab-2b²