Question 137938
Hi,

Given y = -(x-2)^2

To show if the graph is concave up or down, you do not have to solve it necessarily.

The given equation is y = -(x^2-4x+4) [ on expansion ]
                        = -x^2 + 4x - 4

As the quadratic term , that is x^2 term is negative, the graph is concave down.

Positive implies concave up and negative concave down.

Hope it is clear.

dolly