Sergey is solving 5x2 + 20% – 7 = 0. Which steps could he use to solve the quadratic equation by completing the
square? Select three options.
5(x2 + 4x + 4) = -7 + 20
X+2 = + 27
5(x2 + 4x) = 7
5(x2 + 4x + 4) = 7 + 20
5(x2 + 4x) = -7

Step-by-step explanation:

we have

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

step 2

Factor 5 left side

step 3

Complete the square

step 4

Rewrite as perfect squares

step 5

step 6

< 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⭐