2x (x + 2) + x = 7 kuadrat sempurna
Matematika
fiyah09
Pertanyaan
2x (x + 2) + x = 7 kuadrat sempurna
2 Jawaban
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1. Jawaban deviesllnurutam
2x^2 +4x+x-7 =0
2x^2 +5x -7 -
2. Jawaban arsetpopeye
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