Question

If x - 10 is a factor of x2 - 8x - 20, what is the other
factor?

Answer 1

(×+ 2)

Explanation:

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Answer 2

(x + 2)

Explanation:

x² - 8x - 20

consider the factors of the constant term (- 20) which sum to give the coefficient of the x- term (- 8)

the factors are - 10 and + 2 , since

- 10 × + 2 = - 20 and - 10 + 2 = - 8 , then

x² - 8x - 20 = (x - 10)(x + 2)