Question

If x = 4+ √15 , find the value of X3 - 1 ÷ X3

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Answer 1

Answer:

If x=4+√15 , find the value of x³-1/x³ ANSWER IS 126√15

Answer 2

Step-by-step explanation:

X = 4 + root15

1 = 1 = 4–root15 = 4–root15

X 4+root15 (4+root15)(4–root15)

X– 1 = 4+root15 – 4+root15 = 2root15

X

X³– 1 = ( X – 1 )³ + 3( X – 1 )

X³ X X

= ( 2root15)³ + 3( 2root15)

= 120root15 + 6root15

= 126root15

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