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y=x+p
substitusi ke x^2+y^2-2x-7=0
x^2+(x+p)^2-2x-7=0
x^2+x^2+2px+p^2-2x-7=0
2x^2 +(2p-2)x +(p^2 -7)=0
menyinggung, maka D=0
b^2 -4ac=0
(2p-2)^2 -4(2)(p^2-7)=0
4p^2 -8p +4 -8p^2 +56 =0
-4p^2 -8p +56=0
p^2 +2p -14 =0
krn nda' bisa difaktorkan
pake rumus abc saja (-b +- VD)/2a