SOLUTION: Dear tutor,I 've checked one of the problems which was like my question but I couldn't mach the answer with mine.could you help me in this way ?
Choose the answer Of {{{x^4+1/x^4
Algebra.Com
Question 201628: Dear tutor,I 've checked one of the problems which was like my question but I couldn't mach the answer with mine.could you help me in this way ?
Choose the answer Of if :
a.)
b.)
c.)
d.)
e.)
Answer by RAY100(1637) (Show Source): You can put this solution on YOUR website!
x + 1/x =8
(x^2 +1 ) / x =8
x^2 +1 = 8x
x^2 -8x +1 =0
.
using quadratic eqn,, x= 7.873,,.127
,
substitute either in
.
X^4 +(1/x^4) = 3842
.
checking answers, this matches (E) (8^4 -2^8 +2)
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