Factor the polynomial by grouping.
4x4 + 20x3 − 7x − 35

(x+5)(4x3−7)

Step-by-step explanation:

I just used Mathpapa so it didn't give me a step by step

< 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⭐