its a simple parobola symmetric about y axis, having its vertex at (0,-4).
we can make its graph by changing its equation in standard form so that we can get its different standard points like vertex, focus, etc.
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It is, as stated, x2 - 5x + 25/4 = 0
So u have the function x2-4=0 Now because 4 is a squared number, its square root is 2 (x+2)(x-2)=0
type you answer here!
(x - 5)(x + 4)
D = {x [element of reals]}R = {y [element of reals]|y >= 4}