Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 14)
What is a² - 4 factorized?
(a - 2)(a - 2)
(a + 2)(a + 2)
(a - 2)(a + 2)
(a + 4)(a - 1)
Vysvětlení
Using difference of squares formula a²-b² = (a-b)(a+b), so a² - 4 is (a-2)(a+2)