Y= {x | x element of set n and 16 < x < 25} ?

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this

why are you giving so many marks make your marks less and make a question list so that i can understand your question very nicely