Answer :
If LHS is
x2 + 7x + 12
Then RHS would be
⇒ x2 + 7x + 12
Putting x = (-3)
= (–3)2 + 7 (–3) + 12
= 9 + (-21) + 12
= 21-21
= 0
The error is (-21) instead of 4 and end result 0 instead of 25
Hence putting x = (-3) in x2 + 7x + 12 results to 0
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