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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Mathematics

Aleena

8 January, 18:21

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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Answers (1)

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Miranda Ray · Answer 1

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.