Mathematics - Algebra - Quadratics - Solving by factoring - Zero Product Property

'If A × B = 0, what do we know?' Options: A=0 only, B=0 only, A=0 or B=0 (or both), Nothing. The key insight: if a product is zero, at least one factor MUST be zero. So if (x-3)(x+2)=0, then either x-3=0 (x=3) or x+2=0 (x=-2). Do 4 quick zero-product problems to build this foundation.