Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 36)
Which of these represents a 'perfect square' trinomial?
x² - 2x + 1
4x² + 12x + 9
x² + 4x + 8
9x² - 6x -1
Paliwanag
Perfect square trinomials can be expressed as (ax+b)² or (ax-b)²