(b-3)(a+9)(1-b)=(ab-3a+9b-27)(1-
-b)=ab-ab²-3a+3ab+9b-9b²-27+27b=9b²-ab²+4ab-3a+36b-27
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(b-3)(a+9)(1-b)=(ab-3a+9b-27)(1-
-b)=ab-ab²-3a+3ab+9b-9b²-27+27b=9b²-ab²+4ab-3a+36b-27