Use completing the square to solve the equation x^2 - 10x = -8.
which equation is used in the process?
a. x^2 - 10x + 25 = 17
b. x^2 - 10x + 25 = -8
c. x^2 - 10x - 25 = -33

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐