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