Matematika

Pertanyaan

tolong dong kaak hehe dibantu
tolong dong kaak hehe dibantu

1 Jawaban

  • 1. 6x² + 7x = 5
        6x² + 7x - 5 = 0
        x₁.₂ = (-b+-√(b² - 4ac)) / 2a
               = (-7 +-√7² - 4.6.(-5))/ 2.6
               = (-7 +- √49 + 120 )/12
               = (-7 +- √169) / 12
               = (-7 +- 13) / 12

       x₁ = (-7 + 13) / 12
           = 6 / 12
           = 1/2

       x₂ = (-7 - 13) / 12
           = -20 / 12
           = -5/3

    2. 3x² + 4x - 4 = 0
        x₁.₂ = (-b+-√(b² - 4ac)) / 2a
              = (-4 +- √(4² - 4.3.(-4)) / 2.3
              = (-4 +- √16 + 48) / 6
              = (-4 +- √64) / 6
              = (-4 +- 8) / 6

        x₁ = (-4 + 8) / 6
            = 4 / 6
            = 2/3

       x₂ = (-4 - 8) / 6
           = -12 / 6
            = -2