y2 + 10z - 10y - yz
= y2 - 10y - yz + 10z
= y(y - 10) - z(y - 10)
= (y - 10)(y - z)
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That factors to y(y2 + 7y - 5)
Equation of circle: x^2 +y^2 = 12x-10y-12 Completing the squares: (x-6)^2 +(y+5)^2 = 49 So center of circle is at (6, -5) and its radius is 7 units
(y2+13y+22)/(y+2) = (y+11)
To multiply two binomials you use FOIL (first, outer, inner, last): (y-9)(y+10)=y*y+10y-9y-9*10=y2+y-90
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