Mathematics for IGCSE & O level - Equations (Section 8 - No. 23)
In the equation x² - 6x + 9 = 0, after completing the square, what does it become?
(x - 3)² = 0
(x + 3)² = 0
(x - 3)² = 9
(x - 6)² = 9
설명
Completing the square means (x - (6/2))² = 0, then (x - 3)² = 0.