Question

if
$x - 2 \div x = 5$
find
$x {}^{3} - 8 \div x {}^{3}$
​

Answer 1

x- 2/x=5 Given

we have to find

x³- 8/x³

x -2/x=5

{x³-(2/x)³- 3*x*2/x(x- 2/x)=125

by cubing both sides

{x³- 8/x³ -6(5)}=125

x³- 8/x³=125+30

x³- 8/x³=155

hope it helps

:-)

Answer 2

Step-by-step explanation:

x-2÷x= 5

find

x3-8÷x3

So

. x÷x-2=5

x÷x= 5+2

x= 7

x3-8÷x3

x is 7

so

7*7*7-8÷7*7*7

343-8÷343

342.97