iloczyn (5x - 2y) (5x+ 2y ) jest równy ; ?
A.25x do kwadratu + 4y kwadrat
B. 25x kwadrat - 4y kwadrat
C. 25x kwadrat - 2yy
D. 25x kwadrat -10xy - 4y kwadrat.
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odpowiedź B
25x kwadrat - 4y kwadrat
(5x - 2y) (5x+ 2y )=25x²-4y²
Odp B