x³- 25x=х×(х²-25)= х×((х-5)(х+5)
a²+5a+5b-b²=(a²-b²)+(5b+5a)= (а - b)×(а-b) +5 ×(а+b)= (а+b)×(а-b +5)
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x³- 25x=х×(х²-25)= х×((х-5)(х+5)
a²+5a+5b-b²=(a²-b²)+(5b+5a)= (а - b)×(а-b) +5 ×(а+b)= (а+b)×(а-b +5)