Решите уравнения: 69-(13-y)²=-y²

Question

Решите уравнения: 69-(13-y)²=-y²

Answer 1

69-169-y^2=-y^2
0=100

Comments

69-(169-26y+y^2)=у^2
69-169+26у+у^2=-у^2
69-169+26у=0
-100+26у=0
26у=100
у= 50/13