Let the roots of the equation α,β,γ,δ for the equation, x4−2ax2+4bx2+8ax+16=0 α×β×γ×δ=16 ...... (I) For the reciprocal equation roots are pα,pβ,pγ‌and‌p‌δ So product of the roots is 1. p4αβγδ=1 ...... (II) From equation (I) and (II) , |p|=