69-(13-у)во2степени=-у во 2степени

Question

69-(13-у)во2степени=-у во 2степени

Answer 1

69-(13-y)²=-y²

69-(169-26y+y²)=-y²

69-169+26y-y²=-y²

69-169+26y=0

-100+26y=0

26y=100

y=50/13=3 11/13