Question

Answer the questions accordingly​

Answer 1

Answer:

x=(2+√5)⅓ +(2-√5) ⅓

x³=[(2+√5)⅓ +(2-√5) ⅓]³

= 2+√5 +2-√5 +3*(2+√5)⅓ *(2-√5) ⅓{2+√5)⅓ +(2-√5) ⅓}

= 4+3*(2+√5)⅓ *(2-√5) ⅓ *x

=4+3x*{(2+√5) (2-√5) }⅓

= 4+3x*(4-5) ⅓

=4+3x*(-1) ⅓

=4+3x*(-1)

=4-3x

x³=4-3x

x³+3x=4

_________