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30-04-2017
Mathematics

contestada

what number should be added to both sides of the equation in order to complete the square?
1. x2 + 20x = 10
2. x2 - 4x = 8
3. x2 + 5x = 3
4. x2 - 9x = 5
5. 2x2 - 48x = 10

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Аноним Аноним

04-05-2017

the correct answer is (x-4)^2=21
|x-4|=+\-21
x-4=21
x=25
x-4=-21
x=-17
x=25

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