✨ Best Answer ✨
＝{(a−(2b−5)｝{(a+(2b−5)｝
＝(a−M)(a+M)
＝a²−M²
＝a²−(2b−5)²
＝a²−(4b²−20b+25)
＝a²−4b²+20b−25
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