Question

If x =4-root 15 find the value of x^3+1/a^3

Answer 1

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

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