SOLUTION: write x square plus eight x minus twenty is less tha zero in interval notation form

Question 367675: write x square plus eight x minus twenty is less tha zero in interval notation form

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

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Break up the number line into 3 regions using the critical points of the function.
Region 1:(,)
Region 2:(,)
Region 3:(,)
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For each region, choose a point in the region (not an endpoint).
Test the inequality.
If the inequality is satisfied, the region is part of the solution region.
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Region 1:

False, Region 1 is not part of the solution region.
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Region 2:

True, Region 2 is part of the solution region.
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Region 3:

False, Region 3 is not part of the solution region.
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Solution Region:(,)
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Graphical verification: Look for regions where the function is below the x-axis ()
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