Question

Решите уравнение
(х-9)^2=(x-3)^2

Answer 1

(x-9)²=(x-3)²
(x-9)²-(x-3)²=

Formula: a²-b²=(a+b)(a-b)

(x-9+x-3)(x-9-x+3)=0
(2x-12)(-6)=0
2x-12=0
2x=12
x=6