x-1/x=13 then value of 171x^2-x^4
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Answer:
85/72
Step-by-step explanation:
x-1/x=13
x-1=13x
12x=-1
x=-1/12
put the value of x in above equation
171(-1/12)^2 - (-1/12)^4
171(1/144) - (1/20736)
(171 - 1)/144
85/72 = 1.1805
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