Use Pascal'sTriangle to expand (3a-2)^3

Use Pacals Triangle to solve.
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(3a-2)^3=27a^3 -54a^2 +36a -8

me dont see that Paskals triangel help

it du (x+1)^3  & maebee help with (x-1)^n

but not 3 & 2
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