Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 37)
Identify the expression that is the same as x^2 - 4
(x+2)(x-2)
(x-2)(x-2)
(x+2)(x+2)
(x+2)(x-2)
Vysvětlení
The expression x^2 - 4 is a difference of squares. Factorizing it results in (x + 2)(x - 2).