anonymous
  • anonymous
HELP im lost!!! What is the radius of a circle given by the equation (x+1)^2+(y-2)^2=64
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
whats the general equation of a circle?
precal
  • precal
radius is 8
anonymous
  • anonymous
is it? how?

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amistre64
  • amistre64
good question :)
amistre64
  • amistre64
the general equation of a circle is defined as: x^2+y^2 = r^2 so that that last bit is the radius
amistre64
  • amistre64
if we compare this to what you have; that amounts to r^2 = 64; therefore r = 8
anonymous
  • anonymous
yea so do you square the radius at the end? just that?
amistre64
  • amistre64
yep; other equation might have to be worked INTO this form, but if they are already looking like this then the radius is the sqrt of the last bit
anonymous
  • anonymous
ooohhh ok
anonymous
  • anonymous
thank you i got it!:D
amistre64
  • amistre64
good ;)

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