if 3x-1/3x=4 find the value of x^2 + 1/81x^2
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Answer:
3x - 1/(3x) = 9
Squaring both sides, we get,
9x2 + 1/9x2 - 2 = 81
9x2 + 1/9x2 = 83
9 [x2 + 1/(81x2)] = 9x2 + 1/9x2 = 83
x2 + [1/(81x2)] = 83/9
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