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If one root of the equation x² - 7x + k = 0 is 3, what is the value of k? (2020)

Practice Questions

1 question
Q1
If one root of the equation x² - 7x + k = 0 is 3, what is the value of k? (2020)
  1. 10
  2. 12
  3. 15
  4. 9

Questions & Step-by-step Solutions

1 item
Q
Q: If one root of the equation x² - 7x + k = 0 is 3, what is the value of k? (2020)
Solution: Using the root, substitute x = 3: 3² - 7*3 + k = 0, which gives k = 9.
Steps: 0

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