Question

Write the standard form of the equation of the circle with the given characteristics center (-7,-4) radius 7

Answer 1

This is an eyeball problem. You should write it down about as quickly as you can read the problem statement.

Standard form of a circle is (x-h)^2 + (y-k)^2 = r^2, where the center is (h,k) and the radius is r. Since this is EXACTLY the information we have been given, we are done!

(x-(-7))^2 + (y-(-4))^2 = 7^2

This can be simplified a little:

(x+7)^2 + (y+4)^2 = 49

Seriously, get good at it and get fast!

Answer 2

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