Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 1)
When factoring x² + 4x + 4, what is the factored form?
(x + 2)(x + 2)
(x - 2)(x - 2)
(x + 4)(x + 1)
(x - 4)(x - 1)
คำอธิบาย
x² + 4x + 4 is a perfect square trinomial, which factors to (x + 2)² or (x + 2)(x + 2).