find the vertex ,zero(s) ,and y-intercept of the graph of y = 2x^2 +8x - 90

Answer 1

2x^2 + 8x - 90 = ((2x + 18)(x -5)

Vertex occurs when x = -8/4 = -2 when y = -98, i.e.vertex is (-2,-98)

zeros: 5, -9

y intercept = -90 (substitute x = 0)