Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 47)
What is the factored form of 4x² - 25?
(2x - 5)(2x - 5)
(2x + 5)(2x - 5)
(4x + 1)(x - 25)
(2x + 5)(2x + 5)
説明
Using the difference of squares formula, a²-b²= (a-b)(a+b), (2x+5)(2x-5) is the answer