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brittneyhiebert2543
04.01.2020 •
Mathematics
If x-1/x = 9 find the value of x +1/x
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Ответ:
Step-by-step explanation:
Given
x -
= 9 ← square both sides
(x -
)² = 9²
x² - 2 +
= 81 ( add 2 to both sides )
x² +
= 83
Now
(x +
)² = x² +
+ 2, thus
x² +
= 83 + 2 = 85
(x +
)²= 85 ( take the square root of both sides)
x +
= ![\sqrt{85}](/tpl/images/0442/4548/d7bf2.png)
Ответ: