factorise (a+2b)2 - 9c2
Answers
Answered by
1
Answer:
a
2
b
2
−6abc+9c
2
=(ab)
2
+2×ab×(−3c)+(−3c)
2
Using a
2
+b
2
−2ab=(a−b)
2
=(ab−3c)
2
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