Question

Factor: 5x2 – 15x – 20.

(a) 5(x-4)(x+1),

(b) -2(x-4)(x+5),

(c) -5(x+4)(x-1),

(d) 5(x+4)(x+1).
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Answer 1

Answer:

a is the correct answer

Answer 2

Answer ⤵

5x2–15–20

=> 5[x^2-3x-4]

=> 5[x^2-4x+x-4]

=> 5[x(x-4)+1(x-4)]

=> 5(x-4)(x+1).

Option no a