Yes, because when you simplify it (x+3)(x+4)=0 it will become x²+7x+12=0 and the standard form of quadratic equation is ax²+bx+c=0, and the highest exponent in a quadratic equation is 2.
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But ate wait so the ax² is equal to 0? Edi linear siya, diba?
Quadratic equations are always equals to zero.