Question

Please answer it I need immediately. so please.​

Answer 1

Answer:

i upload the pic of solution

Step-by-step explanation:

(x+1/x=7)*3 + 1/ (x+1/x=7)

Answer 2

Answer :

x³ + 1/x³ = 322

Solution :

• Given : x + 1/x = 7
• To find : x³ + 1/x³ = ?

We have ;

x + 1/x = 7

Now ,

Cubing both the sides , we have ;

=> (x + 1/x)³ = 7³

=> x³ + (1/x)³ + 3•x•(1/x)•(x + 1/x) = 343

=> x³ + 1/x³ + 3•1•7 = 343

=> x³ + 1/x³ + 21 = 343

=> x³ + 1/x³ = 343 - 21

=> x³ + 1/x³ = 322

Hence ,

x³ + 1/x³ = 322