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  • 16-12-2020
  • Mathematics
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devishri1977
devishri1977 devishri1977
  • 16-12-2020

Answer:

36

Step-by-step explanation:

x² + 12x - 40 = 0

x² + 12x    = 40

Now, 12/2 = 6. So add 6² = 36 to each side

x² + 12x + 36 = 40 +36

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