Mischa wrote the quadratic equation 0=-x2+4x-7 in standard form. if a = -1, what is the value of c in her equation?

For this case we have that by definition, a quadratic equation in its standard form is given by:

In this case we have the following equation:

So, according to the standard form we have:

The value of c is -7.

< 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⭐