Answer :
If LHS is
(3x)2 + 4x + 7
Then RHS would be
⇒ (3x)2 + 4x + 7
= 32 × x2 + 4x + 7
= 9x2 + 4x + 7
The error is 9x2 instead of 3x2
Hence (3x)2 + 4x + 7 = 9x2 + 4x + 7
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