if x²+1/x²=7,find the value of x³+1/x³
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Answered by
9
Hey mate..
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(x + 1/x)2
= x2 + 1/x2 + 2
= (x + 1/x)2 = 9
= x + 1/x = 3
Now,
= (x + 1/x)3
= x3 + 1/x3 + 3(x + 1/x)
= 27 = x3 + 1/x3 + 9
or,
x3 + 1/x3
= 27 - 9 = 18
it shoul be the answer
=========
(x + 1/x)2
= x2 + 1/x2 + 2
= (x + 1/x)2 = 9
= x + 1/x = 3
Now,
= (x + 1/x)3
= x3 + 1/x3 + 3(x + 1/x)
= 27 = x3 + 1/x3 + 9
or,
x3 + 1/x3
= 27 - 9 = 18
it shoul be the answer
Answered by
1
Step-by-step explanation:
it is conclude that 36 is the answer
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