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To find the vertex, you will need to use the vertex formula which is x = -b/ 2a. For this problem, the vertex is -1.
To find x-intercepts, you will need to let y=0 and solve for x and let x=0 and solve for y to find the y-intercept.
x = -b/2a = -12/(2*3) = -2
Refer to the attachment.