2 Answers

Ext · Answer 1 · 2020-12-10T15:32:28+0000

Answer:

C

Explanation:

Factor, where possible the expressions on the numerators/ denominators

3x - 21 = 3(x - 7) ← common factor of 3

x² + 3x = x(x + 3) ← common factor of x

7x - 49 = 7(x - 7) ← common factor of 7

The rational expression can now be written as

(3(x-7))/(x) ×
(x(x+3))/(7(x-7))

Cancelling the factors x, x - 7 on the numerator/denominator leaves

(3(x+3))/(7) → C

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