Answer-Which of the following is not a quadratic equation?

ATQ, Option 1 LHS K3K7 3K7K RHS K2 K4K4 Quadratic Option 2 LHS 2K3K1 2KK3 RHS K32K6 2K18 Equation 2KK3 2K18 Cancel 2K K3 18 K 15 Linear Not quadratic Option 3 LHS K2 5 K4K9 RHS 5K17 Quadratic Option 4 LHS K7 5K K14K49 5K K9K49 RHS 3K8 Quadratic Hence, Option 2 is NOT a quadratic equation