Question

a=4+ root 15 then a cube + 1/a cube​

Answer 1

Step-by-step explanation:

a = 4 + √15

1/a = 4 - √15

(a+1/a) = ( 4 + √15 ) + ( 4 - √15 ) = 8

(a³+1/a³) = (8)³ -3*8 = 512 - 24 = 488 [ Ans.]

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