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skro
@skro
August 2022
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Помогите пожалуйста, очень нужно
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fanta2310
Verified answer
№ 1.
А-4
Б-3
И-1
Г-2
№ 3. думаю ответ 3
№ 4.
х² + 7х - 18 = 0
D = b² - 4ac = 7² - 4 * 1 * (-18) = 49 + 72 = 121
D > 0 корней будет два
- b + √D - 7 + √121 - 7 + 11 4
Х1 =-------------------- = ----------------------- = ------------------- = ----------- = 2
2 * a 2 * 1 2 2
-b - √D - 7 - √ 121 - 7 - 11 - 18
Х2 = ---------------- = ------------------- = -------------- = ----------- = - 9
2 * a 2 * 1 2 2
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Answers & Comments
Verified answer
№ 1.А-4
Б-3
И-1
Г-2
№ 3. думаю ответ 3
№ 4.
х² + 7х - 18 = 0
D = b² - 4ac = 7² - 4 * 1 * (-18) = 49 + 72 = 121
D > 0 корней будет два
- b + √D - 7 + √121 - 7 + 11 4
Х1 =-------------------- = ----------------------- = ------------------- = ----------- = 2
2 * a 2 * 1 2 2
-b - √D - 7 - √ 121 - 7 - 11 - 18
Х2 = ---------------- = ------------------- = -------------- = ----------- = - 9
2 * a 2 * 1 2 2