Answer:
x-intercepts (-4, 0) and (2,0)
Vertex is ( - 1, -9)
Step-by-step explanation:
X- intercepts
y=0
(x+4)(x-2)=0
x = - 4, x =2 or at can be written as (-4, 0) and (2,0)
Vertex
y = (x+4)(x - 2) =x² -2x +4x - 8 = x² + 2x - 8²
y = x² + 2x - 8
To find vertex we need to write equation in vertex form by completing square.
y = x²+2x -8 = x² + 2*1*x + 1² - 1² - 8 = (x+1)² - 9
y = (x+1)² - 9
Vertex is ( - 1, -9).
