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makvit [3.9K]
3 years ago
9

[NO LINKS]

Mathematics
2 answers:
Lesechka [4]3 years ago
8 0

Answer:

  • No

Step-by-step explanation:

  • x² – 8x – 9 = 0
  • x² – 8x = 9
  • x² – 8x + 16 = 9 + 16
  • (x – 4)² = 25
  • x – 4 = 25 and x – 4 = - 25 ⇒ Incorrect, should be x - 4 = 5 and x - 4 = -5
  • x = 29 and x = -21                ⇒ Incorrect, should be x = 9 and x = -1
earnstyle [38]3 years ago
7 0

Answer:

No, it's wrong

{x}^{2}  - 8x - 9 = 0 \\ (x - 9)(x + 1) = 0 \\ x = 9 \: and \:  - 1

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