Question

What number in the vertex form of the equation y= 3(x – 4)2 + 5 indicates that the parabola opens up?
answer please

Answer 1

the vertex does not indicate opening up, but the 3 in front of the parenthesis tells us the parabola is opening up because it is a positive 3.

Answer 2

It says the equation is in vertex form. In the sense, that the vertex is 4, 5

Answer 3

You are right though that the fact it is positive 3 times the quadratic in x says it is opening up.