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Sarah was explaining her first step in​ factoring, but made an error in her explanation.

Factor: 5x^2-4x-9
Sarah said, "I know a=5, b=-4, and c=-9. Now, I need to find the factor of -9 that add to -4." What was the error in her thought process.

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Sarah's error was that she was trying to find the factors of -9 that add to -4, when she should have been trying to find the factors of 5x^2-4x-9 that add to -4.
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