The y-intercept is where the function crosses the y-axis (x=0)
(0,-4)
j(x) = x^2 +3x -4
j(0) = 0+0-4
j(0=-4
The x-intercept is where the function crosses the x-axis (y=0)
(-4,0)
The axis of symmetry x is where the function has symmetry (see graph attached)
The axis of symmetry is x = 1.5
And finally, the minimum y is -6.25 (also seeing the graph, the lowest value of y)