SOLUTION: (a-b)(aČ+ab+bČ) please show a step by step solution

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Question 248308: (a-b)(aČ+ab+bČ) please show a step by step solution
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
first multiply (aČ+ab+bČ) by a
then multiply (aČ+ab+bČ) by -b
and add the results together
BTW there appears to be something missing
You end it with b*)