The standard form of the equation of a circle is
`(x-h)^2 + (y-k)^2 =r^2`
Fill in the values given for the center of the circle, h and k, as well as the radius given by r.
`(x-5)^2 + (y-7)^2 = 4^2`
`(x-5)^2 + (y-7)^2 =16`
`` Squaring an expression is the same as multiplying the expression by itself twice.
`(x-5)(x-5) +(y-7)^2 =16`
`(x^2 -10x+25) +(y-7)^2 =16`
`(x^2 -10x+25) + (y-7)(y-7) =16`
`(x^2 -10x+25) + (y^2-14y+49) =16`
Combine like terms and reorder the polynomial.
The equation of the circle with center (5,7) and radius 4 is