Math, asked by TejashwiKandpal, 10 months ago

If x+ 1/x= 5 . Then find the value of x3+1/x3. Please answer this. I will rate you brainist. explain with steps​

Answers

Answered by BrainlyChaplin
0

Given:

x + 1/x = 5

To find:

Find the value of x³ + 1/x³ = ?

Formula used:

( a + b )³ = a³ + b³ + 3 ( a + b )

Solution:

x + 1/x = 5

Cubing both sides ,we get

( x + 1/x )³ = (5)³

x³ + 1/x³ + 3 ( x + 1/x ) = 125

x³ + 1/x³ + 3 × 5 = 125

x³ + 1/x³ = 125 - 15

x³ + 1/x³ = 120 .

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