7. If x-1/x = 5, then the value of x?+1/x? equals to
(1 Point)
13
17
25
27
Answers
Answered by
68
EXPLANATION.
⇒ (x - 1/x) = 5.
As we know that,
Squaring on both sides of the equation, we get.
⇒ (x - 1/x)² = (5)².
⇒ x² + 1/x² - 2(x)(1/x) = 25.
⇒ x² + 1/x² - 2 = 25.
⇒ x² + 1/x² = 25 + 2.
⇒ x² + 1/x² = 27.
Hence, option [D] is correct answer.
Answered by
62
Given that , x - 1 / x = 5 .
Exigency To Find : Value of x² + 1 /x² ?
⠀⠀⠀⠀⠀━━━━━━━━━━━━━━━━━━━⠀
⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀¤ Finding Value of x² + 1 /x² :
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