nialiveQueenB nialiveQueenB

18-02-2016
Mathematics

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Find the roots of the polynomial equation. x^2 – x – 72 = 0 Question 1 options: A) 9 and –8 B) –6 and 6 C) –2 and 16 D) –9 and 8

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Panoyin Panoyin

18-02-2016

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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