4x+4/x=5 and find the value of xcube+1/xcube+6
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Answered by
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4x+4/x=5
4x+4=5x
4=5x-4x
x=4
put x=4 in this question
x^3+1/x^3+6
4^3+1/4^3+6
64+1/64+6
65/70
13/14
0.92
4x+4=5x
4=5x-4x
x=4
put x=4 in this question
x^3+1/x^3+6
4^3+1/4^3+6
64+1/64+6
65/70
13/14
0.92
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Answered by
0
or, 4(x+1/x) =5
or,. x+1/x=5/4
or,. cubing both sides:-
or,. (x+1x)³= 125/64
or,. x³+1/x³+3(x+1/x)= 125/64
or. x³+1/x³+3×5/4= 125/64
or,. x³+1/x³= 125/64-15/4
therefore,. putting the value in question
or. 125/64-15/4+6
or,. 269/64 ...............ans
or,. x+1/x=5/4
or,. cubing both sides:-
or,. (x+1x)³= 125/64
or,. x³+1/x³+3(x+1/x)= 125/64
or. x³+1/x³+3×5/4= 125/64
or,. x³+1/x³= 125/64-15/4
therefore,. putting the value in question
or. 125/64-15/4+6
or,. 269/64 ...............ans
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