Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 43)
Which of these expressions is a difference of squares?
x² + 10x + 25
4x² - 9
x² + 4
x² + 6x - 9
Paaiškinimas
4x² - 9 can be written as (2x)² - 3², fitting the form a² - b².