if x+1/x=5then find the value of x^3+1/x^3
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Answered by
4
Answer :
Given that,
x + 1/x = 5
Now, x³ + 1/x³
= (x + 1/x)³ - 3 (x × 1/x) (x + 1/x)
= 5³ - 3 (1) (5)
= 125 - 15
= 110
#MarkAsBrainliest
Given that,
x + 1/x = 5
Now, x³ + 1/x³
= (x + 1/x)³ - 3 (x × 1/x) (x + 1/x)
= 5³ - 3 (1) (5)
= 125 - 15
= 110
#MarkAsBrainliest
Sameen11111:
plz will you explain me that how u get 5
sorry my mistake
thanks
I get it
Answered by
0
Hey mate! Here is your answer.
Formula = (a+b)^3
=a^3+b^3+3ab(a+b)
x+1/x=5
(x+1/x)^3=5^3
x^3+1/x^3+3×x×1/x(1+1/x)=125
x^3+1/x^3+3(5)=125
x^3+1/x^3+15=125
x^3+1/x^3=110
Formula = (a+b)^3
=a^3+b^3+3ab(a+b)
x+1/x=5
(x+1/x)^3=5^3
x^3+1/x^3+3×x×1/x(1+1/x)=125
x^3+1/x^3+3(5)=125
x^3+1/x^3+15=125
x^3+1/x^3=110
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