Question

2×root5+1/root5+1 - 4×root5-1/root5-1=?​

Answer 1

Step-by-step explanation:

=2√5+1/√5+1 -(4√5-1/√5-1)

={[(2√5+1)(√5-1)]-[(4√5-1)(√5-1)]}÷4

={[10-2+√5-1]-[20+4√5-√5-1]}÷4

={[7+√5]-[19+3√5]}÷4

={7+√5-19-3√5}÷4

={7-19-3√5+√5}÷4

={-12-2√5}÷4

=-2(6+√5)/4

=-1(6√5)/2