Verified Answer :

Panoyin

x² - x - 72 = 0
          x² - 9x + 8x - 72 = 0
x(x) - x(9) + 8(x) - 8(9) = 0
         x(x - 9) + 8(x - 9) = 0
                (x + 8)(x - 9) = 0
x + 8 = 0      or      x - 9 = 0
    - 8  - 8                 + 9 + 9
      x = -8        or        x = 9

The answer is A.

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