Y+(5y+2)^2=25(2+y^2)Найдите корень уравнения

Question

Y+(5y+2)^2=25(2+y^2)
Найдите корень уравнения

Answer 1

Y+(5y+2)^2=25 (2+y^2)
y+25y^2+20y+4=50+25y^2
y+25y^2+20y-25y2=50-4

21y=46:21
y=2 4/21

Answer 2

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