Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 10)
If the expansion of a bracket resulted in the expression x² + 2x + 1, what were the original brackets?
(x - 1)(x - 1)
(x + 1)(x - 1)
(x + 1)(x + 1)
(x + 2)(x - 1)
Giải thích
(x+1)(x+1) = x²+2x+1