16) y = - x² + 5x + 5
Если x = 2 , то y = - 2² + 5 * 2 + 5 = - 4 + 10 + 5 = 11
x + y = 2 + 11 = 13
+ - +
____________[- 3]___________[0,5]_____________
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________________________________________[2]_____
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ответ : x ∈ (- ∞ ; - 3] ∪ [0,5 ; 2]
Розв'язання завдання додаю
