DayDay131 DayDay131

03-06-2018
Mathematics

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Which of the following are solutions to the equation below? Check all that apply. x2 + x - 20 = 0

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adrielcavalcant adrielcavalcant

03-06-2018

Δ = 1 + 4*20 = 81
x' = (-1 + 9)/2 = 4
x'' = (-1 - 9)/2 = -5
4² + 4 - 20 = 0
(-5)² - 5 - 20 = 0
Ok !

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lamontgoff14 lamontgoff14

14-11-2019

Answer:-5 and 4

Step-by-step explanation:

apex

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