Find the value of a3 -8b3- 36 ab - 216
When a = 2b+6.
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Step-by-step explanation:
a=2b+6
a-2b=6
now cubing both side
a^3-(2b)^3-3a2b(a-2b)=6^3
=a^3-8b^3-6ab×6=216
=a^3-8b^3-36ab-216=0
a^3-8b^-36ab-216=(a-2b)^3-6^3
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