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pegah
for this question you should first add +1 on both sides of the equation so you will have:
y^2 = 80 + 1 
y^2 = 81 
so the square root of 81 is 9 and -9 so y equals to 9 and -9 :)))
i hope this is helpful
have a nice day
TSO
[tex]y^2 - 1 = 80\\\\y ^2 = 81\\\\y =\sqrt{81}\\\\ y = \pm 9\\\\ y=9\\y = -9[/tex]

Your final answer is -9 and 9.

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