Sadly, you didn't give me any choices to choose from.
y² - 1 = 24
Add 1 to each side :
y² = 25
y = √25
y = +5 and y = -5
Y2 = 25 therefore y can either equal +_ 5
The solutions to the equation y 2 − 1 = 24 are y = 5 and y = − 5 .
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