Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 35)
What is the factored form of 25x² - 49?
(5x - 7)(5x + 7)
(5x + 7)(5x + 7)
(5x - 7)(5x - 7)
(25x - 7)(x+7)
คำอธิบาย
25x² - 49 is the difference of squares, so the factors are (5x - 7)(5x + 7).