Question

Решите уравнение: (y+2)^2-y=(y-1)(1+y)

Answer 1

( y + 2 )^2 - y = ( y - 1 )( 1 + y )
y^2 + 4y + 4 - y = y^2 - 1
3y + 4 = - 1
3y = - 5
y = - 1 2/3