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4 votes
Which value of x is a solution to this equation?

2x^2 − 4x +16 = 0



x = 3

x=2

x = -2

2 Answers

11 votes

Answer:

x = -2

Explanation:

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User Bithin Alangot
by
8.1k points
8 votes

Answer:

Solve the equation:

  • 2x² − 4x + 16 = 0
  • x² - 2x + 8 = 0
  • x² - 2x + 1 + 7 = 0
  • (x - 1)² + 7 = 0
  • (x - 1)² = -7

There is no solution as the square of the number can't be negative

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Note if the equation was 2x² - 4x - 16 = 0, the solution would be:

  • 2x² - 4x - 16 = 0
  • x² - 2x - 8 = 0
  • x² - 2x + 1 = 9
  • (x - 1)² = 3²
  • x - 1 = ± 3
  • x = -2, x = 4

In this case x = -2 is the correct choice

User Kevin Tong
by
8.5k points

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