if x²+1/x²=7then find the value of x³+1/x³
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(x+1/x)² -2 = 7
x+1/x = √9
= 3
now
x³+1/x³
= (x+1/x)(x²+1/x² - 1)
= 3(7-1)
=3×6
=18
x+1/x = √9
= 3
now
x³+1/x³
= (x+1/x)(x²+1/x² - 1)
= 3(7-1)
=3×6
=18
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