Question

Hi, anyone able to help with qn 7? Thanks :)!

Answer 1

Explanation:

I used the quadratic formula to find the roots of
`x^(2) + x -1`

`a=(-1-√(5))/(2) b=(-1+√(5) )/(2)`

`(1 )/(√(3) ) *((-1-√(5))/(2) )^(2) * (-1+√(5))/(2)`

`(1 )/(√(3) ) *((-1-√(5))/(2) ) * (-1+√(5))/(2)*((-1-√(5))/(2) )`

`(1 )/(√(3) ) *((-1-√(5))/(2) ) * (-1+√(5)-√(5) -4)/(4)`

`(1 )/(√(3) ) *((-1-√(5))/(2) ) * ( -4)/(4)`

`(1 )/(√(3) ) *((-1-√(5))/(2) ) * -1`

`(-1-1√(5) )/(2√(3) )*-1`

`(-1-1√(5) )/(2√(3) ) = (√(5)+1 )/(2√(3) )`