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solve ײ - 8× - 9 = 0 by completing the square root​

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[tex]\large{\mathcal{SOLUTION:}}[/tex]

  • x²-8x-9 = 0
  • (x²-8x) = 9
  • (x²-8x+16) = 9+16
  • (x-4)² = 25

Getting the square root

  • √(x-4)² = √25
  • x-4 = ±5

[tex] \\ [/tex]

For x-4 = 5

  • x-4 = 5
  • x = 5 + 4
  • x = 9

For x-4 = -5

  • x-4 = -5
  • x = -5 + 4
  • x = -1

Therefore , the solutions are 9 and -1

[tex] \\ [/tex]

[tex]\large{\mathcal{ANSWER:}}[/tex]

  • 9 and -1

[tex] \\ [/tex]

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