Question

Решите уравнение: (x-9)^2=(x-3)^2

Answer 1

$(x-9)^2=(x-3)^2\ x^2-18x+81=x^2-6x+9\ 12x=72\ x=6$

Answer 2

(х-9)²=(х-3)²
х²-2×х×9+9²=х²-2×х×3+3²
х²-18х+81=х²-6х+9
12х=72
х=6