Решите уравнение x^2+7=(x+7)^2.

Question

Решите уравнение x^2+7=(x+7)^2.

Answer 1

x^2+7=(x+7)^2

 

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

 

14x+49=7

 

14x = 7- 49

 

14x = - 42  /:14

 

x = - 3

Answer 2

x^2+7=(x+7)^2;

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

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

7=14x+49;

-14x=49-7;

-14x=42;

x= -3.