Question

X-2/x=3 ,then find x3-8/x3

Answer 1

Answer:

45

Step-by-step explanation:

We will apply the formula:

(a+b)³=a³+b³+3ab(a+b)

(x+2/x)³=(x)³+(2/x)³+3(x)(2/x)(x+2/x)

(3)³=x³+8/x³+3(*x+2/x)(x+2/x) (*Here x will be cancelled)

x³+8/x³=(3)³+3(2)(*3) (*Given)

x³+8/x³=27+18

x³+8/x³=45

Answer 2

Answer:

45

Step-by-step explanation:

We will apply the formula:

(a+b)³=a³+b³+3ab(a+b)

(x+2/x)³=(x)³+(2/x)³+3(x)(2/x)(x+2/x)

(3)³=x³+8/x³+3(*x+2/x)(x+2/x) (*Here x will be cancelled)

x³+8/x³=(3)³+3(2)(*3) (*Given)

x³+8/x³=27+18

x³+8/x³=45