If x - \(\frac{2}{x}\) = 4, then find x2 + \(\frac{4}{x^2}\).
Answer & explanation
Correct answer: option 2
Squar on both side, we get
(x - \(\frac{2}{x}\))2 = (4)2
x2 + \(\frac{4}{x^2}\) - 2 × x × \(\frac{2}{x}\) = 16
x2 + \(\frac{4}{x^2}\) = 20
If x - \(\frac{2}{x}\) = 4, then find x2 + \(\frac{4}{x^2}\).
Correct answer: option 2
Squar on both side, we get
(x - \(\frac{2}{x}\))2 = (4)2
x2 + \(\frac{4}{x^2}\) - 2 × x × \(\frac{2}{x}\) = 16
x2 + \(\frac{4}{x^2}\) = 20