Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 37)
What is the complete square form of x² + 6x + 5?
(x + 3)² - 4
(x - 3)² + 4
(x + 6)² - 31
(x - 6)² + 41
Giải thích
The process requires adding and subtracting (6/2)² = 9 to form (x+3)² - 9 + 5 = (x+3)² -4