expand (-2x + 7y)(-2x – 7y)
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Answer:
(2x+7y)
2
is of the form (a+b)
2
=a
2
+b
2
+2ab
where a=2x,b=7y
∴(2x+7y)
2
=(2x)
2
+(7y)
2
+2×2x×7y
=4x
2
+49y
2
+28xy
Step-by-step explanation:
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