Question

If X+1 by X equal 4 then find X cube+1 by X cube

Answer 1

x+1÷x=4 therefore x+1=4x :3x=1

therefore x=1/3

x cube +1/x cube=(1/3)cube+1/(1/3)cube

therefore answer is 28

Answer 2

Answer:

28

Step-by-step explanation:

x+1=4x

x+1−4x=4x−4x(Subtract 4x from both sides)

−3x+1=0

−3x+1−1=0−1(Subtract 1 from both sides)

−3x=−1

−3x/ −3 = −1/ −3  (Divide both sides by -3)

x= 1/ 3

x³+1/x³= 1/3³+1 ÷ 1/3³

1/3³= 1/27

1/27+1 ÷ 1/27

1/27+1= 28/27

28/27 ÷ 1/27= 28

THEREFORE, answer is 28