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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GMAT Prep Graph Question
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jangojess
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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
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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beatthegmat
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