Question

if 3x-1/3x=5find9x2+1/9x2​

Answer 1

Answer:

(i) 9x2 + (1/9x2) = (3x – (1/3x))2 + 2

= (5)2 + 2 = 25 + 2 = 27

(ii) 81x4 + (1/81x4) = (9x2 + (1/9x2))2 – 2

= (27)2 – 2 = 729 – 2 = 727

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