POMOCY!
Zapisz w jak najprostszej postaci:
a) (x+3y)2 -9y2
b) 4x2+1-(2x+1)2
c) 2(3+b)2-12b
d) (x-2)2-(x+1)2
daję naj!
a) (x+3y)² -9y²=x²+6xy+9y²-9y²=x²+6xy
b) 4x²+1-(2x+1)²=4x²+1-4x²-4x-1=-4x
c) 2(3+b)²-12b=2(9+6b+b²)-12b=18+12b+2b²-12b=2b²+18
d) (x-2)²-(x+1)²=x²-4x+4-x²-2x-1=-6x+3
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a) (x+3y)² -9y²=x²+6xy+9y²-9y²=x²+6xy
b) 4x²+1-(2x+1)²=4x²+1-4x²-4x-1=-4x
c) 2(3+b)²-12b=2(9+6b+b²)-12b=18+12b+2b²-12b=2b²+18
d) (x-2)²-(x+1)²=x²-4x+4-x²-2x-1=-6x+3