Ans plz About this ..i am tired of solving this
Attachments:
Answers
Answered by
0
please mark me as breanliest
Attachments:
areebajan9876:
Thank you dear
yours welcome
Have a nice day
You are very intelligent
you too
i know that
Hmm
Answered by
1
X+ 1/X = 3
squaring both sides
(X +1/X ) ^ 2 = 9
X ^2 + (1/X ) ^ 2 + 2*X *1/X = 9
X ^2 + (1/X ) ^2 +2 = 9
x^2 +(1/X) ^2 = 7
now
X ^3 +( 1/X )^ 3 = ( X + 1/X ) ( x^2 + 1/ X ^2 - X *1/X )
= (3) ( 7-1 ) = 3*6 = 18
squaring both sides
(X +1/X ) ^ 2 = 9
X ^2 + (1/X ) ^ 2 + 2*X *1/X = 9
X ^2 + (1/X ) ^2 +2 = 9
x^2 +(1/X) ^2 = 7
now
X ^3 +( 1/X )^ 3 = ( X + 1/X ) ( x^2 + 1/ X ^2 - X *1/X )
= (3) ( 7-1 ) = 3*6 = 18
Attachments:
Cant understand
wait let me write it on paper .but his method is easy
check now
Similar questions