24-07-2016
Mathematics

contestada

o quadrado de um numero e igual ao produto desse numero por 3,mais 18 qual e esse numero

Respuesta :

24-07-2016

- Um número => x
- O quadrado de um número => x²
- O produto desse número por 3, mais 18 => 3x + 18

x² = 3x + 18 => x² - 3x - 18 = 0, p/ a = 1, b = -3, c = -18
Δ = (-3)² - 4(1)(-18) = 81
x' = [-(-3) + 9]/2 = 12/2 = 6
x" = [-(-3) - 9]/2 = -6/2 = -3

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