Which equation could be solved using the graph above?
x^2+4x+3=0
x^2-4x+3=0
x^2-6x+9=0
x^2-1=0

Option A.

Step-by-step explanation:

The vertex form of a parabola is

where, (h,k) is vertex and a is a constant.

The vertex of the parabola is (-2,-1).

Substitute h=-2 and k=-1 in the above equation.

    .... (1)

The parabola passes through the point (0,3). So, it must be satisfy by the point (0,3).

Substiturte a=1 in equation (1).

On simplification we get

It means the equation could be solved using the given graph.

Therefore, the correct option is A.

you can use a^2+ b^2=c^2