Perform the indicated operations. Write the answer in standard form, a+bi.
(9 + 2i)(9 - 2i)

It can't be expressed in that form

Step-by-step explanation:

From difference of two squares:

a » 9

b » 2i

but i² is -1 [ complex numbers ]

u dumb boi

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⭐