if P = 2 - A prove that a ^3+6ap+p^3-8 =0
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p = 2 - A --------------(1)
LHS is a^3 +6ap + p^3 - 8
so , a^3 +6a(2-A) +(2-A)^3 -8 .......[from Eq (1)]
=a^3 +12a -6a^2 +2^3 -3×2^2 a + 3×2a^2 -a^3 -8
=a^3 +12a -6a^2 +8 -12a +6a^2 -a^3 -8
=0
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