Mathematics for IGCSE & O level - Equations (Section 5 - No. 46)
When solving the equation x² - 49 = 0 by factorization, the solutions are:
x = 7
x = -7
x = 7 and x = -7
x = 49
Giải thích
The equation factors to (x-7)(x+7) = 0, giving solutions x = 7 and x = -7.