Question

решите уравнение (х+5)²-х²=х-2

Answer 1

Ответ:

$(x + 5) {}^{2} - x {}^{2} = x - 2 \\ x {}^{2} + 10x + 25 - x {}^{2} = x - 2 \\ 10x + 25 = x - 2 \\ 10x - x = - 2 - 25 \\ 9x = - 27\\ x = - 27 \div 9 \\ x = = - 3$