Solution
$$x^4 + x^{-4} = 194$$
$$(x^2 + x^{-2}) ^2$$= $$x^4 + x^{-4}$$ + 2 = 194 + 2 = 196
$$(x^2 + x^{-2})$$ =14
$$(x+ x^{-1}) ^2$$ = $$(x^2 + x^{-2})$$ +2 =14 + 2 =16
$$x+ x^{-1}$$ = 4
$$x^{2}$$ -4x +1 =0
$$(x - 2)^{2}$$ = $$x^{2}$$ -4x +4 = $$x^{2}$$ -4x +1 + 3 = 0 + 3 =3
So , the answer would be Option d)3.
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
