Hi,

y = 4x^2 - 24x + 40   | x = 0, y = 40

y = 4(x-3)^2 - 36 + 40   |Completing Square: y = 4x^2 - 24x +36  - 36+ 40

  vertex form of a parabola,  where(h,k) is the vertex 

y = 4(x-3)^2 +4   V(3,4), Parabola Opening Upward a = 4 >0, does not cross x-axis 



 

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