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the equation x^2 + y^2 + 21 = 40 + 18y. What is the radius of this cookie?
Question
the equation x^2 + y^2 + 21 = 40 + 18y. What is the radius of this cookie?
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Mathematics
3 years
2021-08-14T17:41:40+00:00
2021-08-14T17:41:40+00:00 1 Answers
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Answers ( )
Answer:
The radius is 10
Step-by-step explanation:
Given
Required
The radius
Rewrite as:
Subtract 81 from both sides
Expand
Factorize
Factor out y – 9
Express as squares
The equation of a circle is:
By comparison: