Answer :
If LHS is
(x + 7)2
Then RHS would be
⇒ (x + 7)2
= (x)2 + 72 + 2 × x × 7
= x2 + 49 + 14
The error is x2 + 14x + 49 instead of x2 + 49
Hence (x + 7)2 = x2 + 14x + 49
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