Question

Fan and Medal

Solve using perfect square factoring patterns.
y^2 + 18y + 81 = 0









A.

{9, –9}








B.

{0, –1}








C.

{–9}








D.

{9}

Answer 1

@atoxicguy

Answer 2

y^2 + 18y +81 = 0
y^2 + 9y + 9y + 81 = 0
y( y+9) + 9(y+9) = 0
(y+9)*(y+9) = 0
(y+9)^2 = 0
y+9 = 0 and y+9 = 0 => y = -9 in both cases

Answer 3

isn't that what u r looking?

Answer 4

so it's C?

Answer 5

C.