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-42=0

-14х=42

х=-3

Answer 2

x^2 + 7= (x+7)^2
x^2+7=x^2+2*7x+7^2
x^2+7=x^2+14x+49

-14x=49-7

-14x=42

x=-3