Question

please tell me its answer tomorrow is my exam...​

Answer 1

Answer:

51

Step-by-step explanation:

Given:  x - 1/x = 7 ______(1)

______________________

Since, a²+b²-2ab = (a-b)²

Or, a²+b² = (a-b)²+2ab

______________________

Now,

x² + 1/x²

= (x - 1/x)²+2*x*(1/x)

= (x - 1/x)²+2

= 7² + 2 ________[ From (1)]

= 49 + 2

= 51

Therefore,

x² + 1/x² = 51

Answer 2

Answer:

Refer to the attachment

hope it helps