Question

Hi. my Previous question wasnt the one, I wanted to ask. I made a mistake,sorry.

the question is this:


if x + 1/x =4

then

x^3 +1/x^3 =?

Answer 1

Answer:

x+1/x=4 ------>1

then

x^2+1/x^2+2=16

x^2+1/x^2=14 --->2

x^3+1/x^3

=(x+1/x) {x^2+1/x^2-1}

=4×13

=52

ok

follow me

guys

Answer 2

$x^{3}+1/x^{3}=52$

Step-by-step explanation:

Given,

$x+1/x=4$

Find value of

$x^{3}+1/x^{3}=?$

Cubic both side

$\left ( x+1/x \right )^{3}=x^{3}+1/x^{3}+3\times x\times 1/x\left ( x+1/x \right )=4^{3}$

$=x^{3}+1/x^{3}+3\left ( x+1/x \right )=4^{3}$

$=x^{3} +1/x^{3} +3\times 4=64$

$x^{3} +1/x^{3}=64-12$

$x^{3}+1/x^{3}=52$