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lep111
@lep111
August 2021
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ВладимирБ
Verified answer
Решение смотри на фото
1 votes
Thanks 1
Universalka
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Сделаем замену:
, m ≥ 0 тогда
m² + m - 20 = 0
m = -5 - не подходит m = 4
Возведём обе части в квадрат:
x²- 2x + 7 = 16
x² - 2x - 9 = 0
D/4 =(- 1)² +9 = 10
X₁ = (1 + √10) X₂ = 1 - √10
(1+√10)(1-√10) = 1 - 10 = - 9
0 votes
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Answers & Comments
Verified answer
Решение смотри на фотоVerified answer
Сделаем замену:
, m ≥ 0 тогда
m² + m - 20 = 0
m = -5 - не подходит m = 4
Возведём обе части в квадрат:
x²- 2x + 7 = 16
x² - 2x - 9 = 0
D/4 =(- 1)² +9 = 10
X₁ = (1 + √10) X₂ = 1 - √10
(1+√10)(1-√10) = 1 - 10 = - 9