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-5(h-2)-3(h-2(h+6)+9)
= -5h+10-3(h-2h-12+9)
= -5h+10-3h+6h+36-27
= -5h-3h+6h+10+36-27
= -2h+19 atau 19-2h
2)
(n-9)(2n+3)
= n.2n+(-9).2n+n.3+(-9).3
= 2n²-18n+3n-27
= 2n²-15n-27
3)
3x²-48y²
= 3(x²-16y²)
= 3(x+4y)(x-4y)
4)
(-3y+4)²
= (-3y)²+2.(-3y).4+4²
= 9y²-24y+16
5)
2xy-3y²+4xz-6yz
= 2xy+4xz-3y²-6yz
= 2x(y+2z)-3y(y+2z)