Intercept Form: y=2 (x+3) (x-5)

Standard Form?

Vertex Form?

I'm not sure but,

Intercept Form to Standard:

y=2 (x+3) (x-5)

y=[x^2-5x+3x-15]

y=[x^2-2x-15]

y=2x^2-4x-30

Standard Form to Vertex:

y=2x^2-4x-30

y=2 (x^2-4) - 30

y = (x^2-4x+4x) - 30-4 (-2)

y=2 (x-2) ^2-22

PS: Im clearly not sure about my answer ...