Question

The vertex of the quadratic function y = 2x^2+8x + c is (x, 3) 
state the value of x-coordinate of the vertex
state the value of c
help please

Answer 1

the x of the vertex of a quadratic in general form is
-b/(2a)
in this case the x of the vertex is -8/4 = -2
now you know the vertex is (-2,3)
plug that into the equation to find c

Answer 2

so what would "c" be?