1.
Let a,b,c,da, b, c, d and pp be non-zero distinct real numbers such that (a2+b2+c2)p22(ab+bc+cd)p+(b2+c2+d2)=0(a^2 + b^2 + c^2) p^2 - 2(ab + bc + cd)p + (b^2 + c^2 + d^2) = 0. Then