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Dennis_Churaev [7]
2 years ago
15

il a positive number decreased by 5, then it is 84 times of its reciprocal. Find the number? op 10, 11, 12, 13​

Mathematics
1 answer:
Alenkasestr [34]2 years ago
6 0

Answer:

x = 12

Step-by-step explanation:

x - 5 = 84/x

x² - 5x = 84

x² - 5x - 84 = 0

x = (5 ±√(5² - 4(1)(-84))) / 2

x = (5 ± 19) / 2

x = -7 ignore

x = 12

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