if x = 9+ 4 root 5 find value of x^4 + 1/x^4
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9 + 4 root 5 = 17.9
(17.9 + 1/17.9)^4 =
((17.9 + 1/17.9)^2)^2 =
((17.9)^2 + 2 (17.9)(1/17.9) + (1/17.9)^2)^2 =
(320.41 + 2 + 1/320.41)^2 =
(322.4131612621)^2 =
103950.24655502 =
103959.3 (approx. )
(17.9 + 1/17.9)^4 =
((17.9 + 1/17.9)^2)^2 =
((17.9)^2 + 2 (17.9)(1/17.9) + (1/17.9)^2)^2 =
(320.41 + 2 + 1/320.41)^2 =
(322.4131612621)^2 =
103950.24655502 =
103959.3 (approx. )
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