(3+4n)²=(3+4n)(3+4n)=9+12n+12n+16n²=9+24n+16n²
(2y-3)³=(2y-3)(2y-3)(2y-3)=(2y-3)(4y²-12y+9)=8y³-24y²+18y-12y²+36y-27=
=8y³-36y²+54y-27
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(3+4n)²=(3+4n)(3+4n)=9+12n+12n+16n²=9+24n+16n²
(2y-3)³=(2y-3)(2y-3)(2y-3)=(2y-3)(4y²-12y+9)=8y³-24y²+18y-12y²+36y-27=
=8y³-36y²+54y-27