Choose the product.
(3x 2 + 2x - 3)(x - 1)
3x 2 + 3x - 4
3x 3 - 5x 2 - 5x + 3
3x 3 - x 2 - 5x + 3
3x 3 + 5x 2 - 5x + 3

Step-by-step explanation:

< 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⭐

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.