adellbakarralus6962 adellbakarralus6962
  • 12-11-2018
  • Mathematics
contestada

Whlch set of numbers contains both solutions to the equation x2 - 2x - 8 = 0?

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tramserran
tramserran tramserran
  • 12-11-2018

Answer: x = {-2, 4}

Step-by-step explanation:

0 = x² - 2x - 8

                    ∧

                 1    -8 = -7

                 2   -4  = -2  This works because the b-value is -2!

0 = (x + 2)(x - 4)

0 = x + 2       0 = x - 4

  x = -2              x = 4

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