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1.
a) (x+2)(y+1)=xy+x+2y+2=x(y+1)+2(y+1)
b) (2a+1)(3-b)=6a-2ab+3-b=6a+3-2ab-b
c) (a-1)(a²-b²)=a³-ab²-a²+b²
d) (2x-1)(y-3)=2xy-6x-y+3
e) (x-y)(a-b+9)=ax-bx+9x-ay+by-9y
f) (k²-2k+2)(t+8)= tk²+8k²-2kt-16k+2t+16
2.
a) (x+1)(x+2)=x²+2x+x+2=x²+3x+2
e) (-x+y)(5x+6y)=-5x²-6xy+5xy+6xy=-5x²+5xy=-5x(x-y)
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1.
a) (x+2)(y+1)=xy+x+2y+2=x(y+1)+2(y+1)
b) (2a+1)(3-b)=6a-2ab+3-b=6a+3-2ab-b
c) (a-1)(a²-b²)=a³-ab²-a²+b²
d) (2x-1)(y-3)=2xy-6x-y+3
e) (x-y)(a-b+9)=ax-bx+9x-ay+by-9y
f) (k²-2k+2)(t+8)= tk²+8k²-2kt-16k+2t+16
2.
a) (x+1)(x+2)=x²+2x+x+2=x²+3x+2
e) (-x+y)(5x+6y)=-5x²-6xy+5xy+6xy=-5x²+5xy=-5x(x-y)