Question

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9. If x - 1/x = 7, evaluate: (i) x2+1/x2​

Answer 1

Step-by-step explanation:

(x - 1/x)^2 = 7^2

x2 + 1/x2 - 2 = 49 ( a - b )^2 = a2 + b2 -2ab

x2 + 1/x2 = 51

Answer 2

Answer:- 51

• x-1/x=7
• (x-1/x)²=49
• x²+1/x²-2=49
• x²+1/x²=51