Ayuden por favor [tex] x ^ {2} - 20x + 91 = 0[ / tex]?

Question

Ayuden por favor [tex] x ^ {2} - 20x + 91 = 0[ / tex].

Angeldavidsandoval · Accepted Answer

x - 13 = - 13x x - 7 = - 7x - 20x x - 13 = 0 x = 13 x - 7 = 0 x = 7.

Geocondasanchez · Answer

Resolver.

X² - 20x + 91 = 0 Aplicamos la formula

x = ( - b ±√(b² - 4ac)) / 2a a = 1 b = - 20 c = 91

x = ( - ( - 20) ± √(( - 20)² - 4(1)(91))) / 2(1)

x = (20 ± √(400 - 364)) / 2

x = (20 ± √36) / 2

x = (20 ± 6) / 2

x1 = (20 + 6) / 2

x1 = 26 / 2

x1 = 13 o

x2 = (20 - 6) / 2

x2 = 14 / 2

x2 = 7

Respuesta.

(7 , 13).

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