Question

na equação x2-7x=4=0

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Answer 1

x^2 - 7x = 4 = 0

x^2 - 7x - 4 = 0

delta = b^2 - 4.a.c

delta = (-7)^2 - 4.1.(-4)

delta = 49 + 16

delta = 65

x = ( - b +- raiz de delta ) / 2.a

x = ( - (-7) +- raiz de 65 ) / 2.1

x = ( 7 +- 8,06 ) / 2

x' = ( 7 + 8,06 ) / 2 = 15,06 / 2 = 7,53

x" = ( 7 - 8,06 ) / 2 = - 1,06 / 2 = - 0,53