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18-03-2021
Mathematics

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how to solve 2x²-8x-90=0

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stefaniyax04 stefaniyax04

18-03-2021

а=2
b=-8
c=-90
D=b^2-4ac
D=64+720
D=784=28^2
X1,2=(-b-+D):2a
Х1,2=(8+-28):4
Х1=-5
Х2=9

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