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1 vote
What are the solutions to the equation y^2-1 = 80?

User Firefog
by
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2 Answers

1 vote

y2−1=80

Step 1: Add 1 to both sides.

y2−1+1=80+1

y2=81

Step 2: Take square root.

y=±√81

y=9 or y=−9

Answer:

y=9 or y=−9

User ZzZombo
by
6.7k points
3 votes

Answer:

y^2-1=80

y^2=81

y = positive and negative 9

User Phileas
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6.9k points