a – bc – ab² from – 7b²a – 21 – a².

plz help me to solve this question.

subtract them​

1 thought on “a – bc – ab² from – 7b²a – 21 – a².<br /><br />plz help me to solve this question.<br /><br />subtract them​”

1. Step-by-step explanation:

   – 7b²a – 21 – a²-(a – bc – ab²)

   – 7b²a – 21 – a²-a+bc+ab²

   -6a²b-21-a²-a+bc

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