Question

If x=4+root15 , find xcube -1/xcube​

Answer 1

Answer:

x = 4 + √ 15

1 / x = 1/ ( 4 + √ 15) * (4 - √ 15) / ( 4 - √ 15) = 4 - √ 15

x + 1 / x = 4 + √ 15 + 4 - √ 15 = 8

x2 + 1 / x2 = ( x + 1 / x)2 - 2

x2 + 1 / x2 = 82 - 2 = 64 - 2 = 62

Ans: 62

Step-by-step explanation:

pls follow and make brainlist pls pls pls pls pls