solve for x under the assumption that x<0. Enter your answer in interval notation using grouping symbols

asked Jan 15, 2022 152k views

1 vote

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Explanation:

x² + 9x < -20

x² + 9x + 20 < 0

(x + 4)(x + 5) < 0

Therefore -5 < x < -4 / (-5,-4)

Anders Abel answered Jan 21, 2022

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