If a,b,c and d are in G.P. show that(a^2+b^2+c^2)(b^2+c^2+d^2)=(ab+bc+cd)^2

If a,b,c and d are in G.P. show that(a^2+b^2+c^2)(b^2+c^2+d^2)=(ab+bc+

1.	If a,b,c and d are in G.P. show that(a^2+b^2+c^2)(b^2+c^2+d^2)=(ab+bc+cd)^2
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