Question

If x^2+1/x^2=9 find the value of x^4+1/x^4.

Answer 1

x²+1/x²=9

Square on both sides,

(x²+1/x²) ²=9²

x⁴+1/x⁴+2(x²*1/x²) =81

x⁴+1/x⁴+2=81

x⁴+1/x⁴=81-2

x⁴+1/x⁴=79



I hope this will help you

Answer 2

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