Help with Gmatprep question please. DS

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Help with Gmatprep question please. DS

by athinabean » Thu Jun 05, 2008 10:51 am
In the xy plane at what two points does the graph of y=(x+a)(x+b)?

1) a+b=-1

2) The graph intesefcts the y-axis at (0,-6)

answer is C

Help! Thanks.
Athinabean