x=5^1/3 - 5^-1/3 then find the value of 5x^3 + 5x
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24
Step-by-step explanation:
5x ^3 = 5[ 25/5-1/5 - 3x]
= 25 - 1 -15x
5x^3 + 15x = 24 - 15 x + 15 x = 24
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