Question

x²-4x=21 ayudaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:3

Answer 1

Respuesta:

Explicación paso a paso:

x²-4x=21

x²-4x-21 = 0

(x - 7) (x + 3) = 0

x - 7 = 0 ....................x = 7

x + 4 = 0 ...................x= -3

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