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GMAT Prep Graph Question

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Senior | Next Rank: 100 Posts
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by ssy » Sat Oct 20, 2007 10:30 pm
Another GMAT prep question...can someone explain the answer please?

In the XY plane, at what 2 points does the graph of y=(x+a)(x+b) intersect the x-axis?

1) a+b = -1

2)Graph intersects y axis at (0, -6)

Answer is C, both statements are sufficient.
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Source: — Data Sufficiency |
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by jangojess » Sat Oct 20, 2007 10:45 pm
ssy....pls keep the ans in spoiler when post any Qs...

here we need to find the at what point the equation intersect x-axis, which means we need to find the solution of (x+a)(x+b) = 0 (y will be 0 when equation intersects at x-axis). we need to find the values of a and b to get the actual solutions of the equation...

stmt 1 - a+b = -1..insuff to get values of a and b.

stm 2 - the graph intersects y-axis at (0,-6)...so substitue the values of y and x in the equation and we get ab = -6...still insuff to get what a and b are....

both - a+b = -1 and ab = -6..from both we can a and b...So suff...ans is C
Trying hard!!!
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by ssy » Sat Oct 20, 2007 10:55 pm
Thanks again JangoJess!

How do I put the answer in a spoiler?
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by beatthegmat » Sat Oct 20, 2007 11:55 pm
When writing a post, you will see a button toward the right-hand side that says 'Spoiler'. Highlight some text that you want to hide and hit this button.

Or, you can just wrap the following code around the text you want to hide.

Code: Select all

[spoiler]Text[/spoiler]
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