Simplify each rational expression by factoring out GCFs first

Question

Numerator: 5k-20

Denominator: 4-k

Answer 1

(5k-20)

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4-k

Factors 5 out of numerator

5(k-4)

--------

4-k

Factors -1 out of denominator

5(k-4)

--------

-1(k-4)

k-4 will cancel

5/-1 = -5

Answer 2

(5k - 20)/(4 - k)

5(k - 4)/-1(k - 4)

-5