Tuesday

March 31, 2015

March 31, 2015

Posted by **nelly** on Tuesday, January 10, 2012 at 12:15pm.

•Every equation of the form

X^2+y^2+ax+by+c=c

•The radius of the circle

x^2+y^2=9 is 3

•The center of the circle

(X+3)^2+(y-2)^2=13 is (3,-2)

- Pre-Calc -
**Damon**, Tuesday, January 10, 2012 at 12:30pmI do not know what the first one is supposed to be, either a typo or totally false

The second is true

the third has the signs backwards, should be (-3 ,2)

- Pre-Calc -
**Steve**, Tuesday, January 10, 2012 at 12:45pmLooks like the first one is intended to be the equation of a circle.

(x^2 + ax) + (y^2 + by) = 0

Unfortunately, if a or b is not zero, there is no real graph.

If a=b=0, then the graph is just the point (0,0).

If there was a typo, giving a "d" on the right-hand side, then given suitable a,b,c,d there will be a circle that satisfies the equation.

- Pre-Calc -
**nelly**, Tuesday, January 10, 2012 at 5:49pmOh yes the first one was a typo it was supposed to be X^2+y^2+ax+by+c=0

**Answer this Question**

**Related Questions**

Pre-Calc (Circles) - Describe the conditions necessary, where circle A has a ...

pre calculus - Write the equation of the circle in standard form. Find the ...

Math - The points (4, –5) and (– 4, 1) are endpoints of a diameter of a circle...

college pre-calculus - 4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where...

NEED MAJOR HELP! *QUADRATIC EQUATIONS* - Write the equation for the circle with ...

pre calc - find the equation of a circle with. Center (0,0), radius 2

Pre-Calc - Describe the conditions necessary for the two circles, where circle a...

Advanced Math - Write the standard form of the equation of a circle that passes ...

pre calc - EAch of 3 circles touch the other 2. Circle A=radius 8cm Circle B=...

math - Write an equation of a circle with the center (-5,-4) and radius 6. The ...