Bài lm nek
Nhớ vote cho mk 5 sao nhé 😉
a) (2x + 5)² = (x + 2)²
-> (2x + 5)² - (x + 2)² = 0
-> (2x + 5 + x + 2)(2x + 5 - x - 2) = 0
-> (3x + 7)(x + 3) = 0
-> 3x + 7 = 0 hoặc x + 3 = 0
-> x = -7/3 hoặc x = -3
b) 4(x - 2)² = 25 (1 - 2x)²
-> 4(x - 2)² - 25 (1 - 2x)² = 0
-> 4(x - 2)² - 25 (2x - 1)² = 0
-> [2 (x - 2)]² - [5 (2x - 1)]² = 0
-> (2x - 4)² - (10x - 5)² = 0
-> (2x - 4 + 10x - 5)(2x - 4 - 10x + 5) = 0
-> (12x - 9)(1 - 8x) = 0
-> 12x - 9 = 0 hoặc 1 - 8x = 0
-> x = 3/4 hoặc x = 1/8