Question

Найдите корень уравнения

Answer 1

${x}^{2} - 14x + 49 - {x}^{2} + 7 = 0 \\ - 14x + 56 = 0 \\ - 14x = 0 - 56 \\ - 14x = - 56 \\ x = - 56 \div ( - 14$
$x = - 56 \div ( - 14) \\ x = 4$
Ответ:4

Answer 2

(x-7)^2=x^2-7

x^2-14x+49=x^2-7

x^2-x^2-14x=-7-49

-14x=-56

x=4

Ответ: 4.