How do you find the vertex and the intercepts for #y = x^2 – 4x + 9#?
vertex is (2,5)
(0,9) is the y intercept
no x intercepts
Complete the square
so the vertex is (2,5)
If we take the equation after we have completed the square
As we cannot take the square root of a negative number there are no roots so it does not cross the