Question

if x2+1/x2=20, find the value of 1) x+1/x 2) x-1/x​

Answer 1

Answer:

x + 1/x = 20

Squaring both sides,

(x + 1/x)^2 = 400

x^2 + 1/x^2 + 2 = 400

x^2 + 1/x^2 = 398

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