if x -1/x=4 find the value of x*2 + 1/x*2
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Answer:
14
Step-by-step explanation:
x²+1/x²
= (x-1/x)² - 2*x*1/x [ Since a²+b²=(a+b)²-2ab ]
= 4² - 2 [ Since x-1/x = 4]
= 16 - 2
= 14
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