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Step2247 [10]
3 years ago
13

X^2+1/x^2=18 find x-1/x

Mathematics
1 answer:
MAVERICK [17]3 years ago
4 0

Notice that

\left(x-\dfrac1x\right)^2=x^2-2+\dfrac1{x^2}=18-2=16

which tells us

x-\dfrac1x=\pm4

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