Which of these equations has a graph that is tangent to the x-axis at one of its intercepts? Choose all the polynomials that have this property. y = ( x + 2)( x + 6) 2 y = x2 + 6 x + 9 y = x4 y = – x3 y = ( x – 5)( x + 3)( x + 1)( x – 5)