Question

Find the vertex of the quadratic equation: y = 2x2 + 8x − 4.

(−2, 20)

(−2, −12)

(2, 20)

(−2, −28)

Answer 1

2(x^2 + 4x - 2) = y
x^2 + 4x - 2 = y/2
x^2 + 4x +4 = y/2 + 6

(x+2)^2 = y/2 + 6

(x+2)^2 - 6 = y/2

2(x + 2)^2 - 12 = y

Answer 2

Oh, okay, I get it now. thank you.,!

Answer 3

cydnimarie has converted your equation to vertex form

Answer 4

You're welcome :)