Is -x2 +8x+1 a constant linear or quadratic

quadratic

Step-by-step explanation:

it is in the form ax^2 +bx +c

this is a quadratic equation

< 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⭐

b, i believe, but not sure.