Разложите на множители (405-416): номер 405.
1) 25x² -9;
2) 4a² -9;
3) 64y² -36²;
4)81a² -16b²
1) 25x² -9;
2) 4a² -9;
3) 64y² -36²;
4)81a² -16b²
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Ответ:
1)25x^2-9=(5x-3)(5x+3)
2)4a^2-9=(2a-3)(2a+3)
3)64y^2-36x^2=(8y-6x)(8y+6x)
4)81a^2-16b^2=(9a-4b)(9a+4b)