How do I find the vertex, axis of symmetry, y-intercept, x-intercept, domain and range of #y=-x^2+4x+1#?
So first let's find the line of symmetry and the vertex.
To complete the square..
-x=2, hence x=-2. and y=-5.
Domain is the set of x values, probably the most confusing concept I've come across in maths till now, yes, I'm ashamed of it.
Although, with the square completed now..
With the range found, plotting a graph and using at least 4 suitable values would help to find the domain.