Intersecting at the x-axis

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dlencz: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Tue Dec 20, 2011 6:26 pmFollowed by: 1 member; Thanked: 2 times

by dlencz » Sat Apr 21, 2012 6:05 pm

In the xy plane, at what two points does the graph of y = (x+a)(x+b) intersect at the x-axis?

1) a+b = -1
2) The graph intersects the y-axis at (0, -6)

OA is C

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Source: Beat The GMAT — Data Sufficiency | Sat Apr 21, 2012 6:05 pm

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Sat Apr 21, 2012 6:34 pm

I posted an explanation here:

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