Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 49)
Which of the following expressions can be factored using the difference of two squares method?
x² + 9
x² - 4
x² + 6x + 9
x² + 2x + 1
解释
The difference of two squares method applies to expressions of the form a² - b². x² - 4 fits this form (x² - 2²).