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[tex](a + 3) \times (5 - a) - (a - 1) {?}^{2} [/tex]
[tex](a + 3) \times (5 - a) - (a - 1) {?}^{2} [/tex]
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Решение:
(а+3)(5-а)-(а-1)²
5а-а²+15-3а-(а²-2а+1)
5а-а²+15-3а-а²+2а-1
4а-2а²+14
-2а²+4а+14
Ответ:
-2(а²-2а-7)