What number must you add to complete the square x^2+xa. 1/2b. 2c. 1/4d. 1

for

when a=1, then the value of c that will make the quadratic a perfect square (allows you to complete the square) is

given x^2+x

b=1

so

answer is C

< 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⭐

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step-by-step explanation:

apex answer