Please help it’s a test and I can’t get logged out

the anwer is B ( i mean second option)

And you can try it

you will find ;

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Step-by-step explanation:

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< 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

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225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225