If x = 4+ √15 , find the value of X3 - 1 ÷ X3
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Answered by
3
Answer:
If x=4+√15 , find the value of x³-1/x³ ANSWER IS 126√15
Answered by
1
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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