a=4-root15 find a+1/a and a2 +1/a2
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Answer:
x = 4 - √15
x² = 16 + 15 - 8√15 = 31 - 8√15
1/x² = 1/31 - 8√15 = (31+8√15) / 961-960 = 31+8√15
x² + 1/x² = 62
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