Find the following showing the steps (x) = 7 - 5x + 7x^2, find f(-9a)

7 + 45a + 567a²

Step-by-step explanation:

to evaluate f(- 9a) substitute x = - 9a into f(x)

f(- 9a) = 7 - 5(- 9a) + 7(- 9a)²

          = 7 + 45a + 7(81a²) = 7 + 45a + 567a²

< 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⭐

step-by-step explanation:

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