Question

-x2+7x-10=0 determine X1= / x2=

Answer 1

-b²±√b²-4ac/2a

-7±√7²-4.-1.-10/2.-1

-7±√49-40/-2

-7±√9/-2

-7±3/-2

x' = -7+3/-2 = -4/-2 = 2

x" = -7-3/-2 = -10/-2 = 5

Answer 2

Ola Luiz 

-x² + 7x - 10 = 0 (multiplique por -1)

x² - 7x + 10 = 0

delta
d² = 49 - 40 = 9
d = 3

x1 = (7 + 3)/2 = 10/2 = 5
x2 = (7 - 3)/2 = 4/2 = 2

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