Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 33)
Which of these expressions is a perfect square trinomial?
x² + 6x + 8
x² - 4x + 4
x² + 5x + 6
x² - 9
Explication
A perfect square trinomial can be factored to the square of a binomial such as (x-2)².