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Re: At how many points does the graph of a quadratic equation cut x axis [#permalink]
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GMATinsight wrote:
At how many points does the graph of a quadratic equation cut x axis

1) Sum of the roots is 5
2) Product of the roots is 6

Souce: https://www.GMATinsight.com


This question asks the number of roots of the equation. Visualize a quadratic equation in a plane.

There are 3 possibilities for a quadratic equation:
1. It has no roots
2. It has 1 root (when the vertex touches the x axis)
3. It has 2 roots

Statement 1 tells us that the equation has at least 1 root, but we don't know whether it has one of two -->Insufficient
Statement 2 tells gives us the same information --> Insufficient

Statements 1+2 tell us that the equation has to have 2 roots, because if it had only 1 root then statements 1 and 2 would give us the same value (if there was only one root its sum and product would be the same) --> Sufficient
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Re: At how many points does the graph of a quadratic equation cut x axis [#permalink]
From Statement 2, cant we say that it will intersect the X-axis at 2 points? As it cannot have only 1 root (6 cannot be written as a product of 2 numbers which are the same except Square root of 6 but a quadratic equation cannot have square root of 6 as the only root as if roots are irrational it must be conjugates)?
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Re: At how many points does the graph of a quadratic equation cut x axis [#permalink]
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