Matematika

Pertanyaan

2x (x + 2) + x = 7 kuadrat sempurna

2 Jawaban

  • 2x^2 +4x+x-7 =0
    2x^2 +5x -7
  • 2x (x + 2) + x = 7
    2x^2 + 4x + x = 7
    2x^2 + 5x = 7
    2x^2 + 5x + 25/8 = 7 + 25/8
    2(x^2 + 5/2x + 25/16) = 81/8
    2(x + 5/4)^2 = 81/8
    (x + 5/4)^2 = 81/16
    x + 5/4 = ±9/4
    x = ±9/4 - 5/4
    x = 9/4 - 5/4 = 4/4 = 1 atau x = -9/4 - 5/4 = -14/4 = -7/2

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