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

Hey mate...

here's the answer...

5x2 – 15x – 20.

= 5(x2 – 3x – 4).

= 5(x2 – 4x + x – 4).

= 5{x(x - 4) +1(x - 4)}.

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

Hope this helps❤️

Answer 2

$\huge\mathcal\pink{AnSwEr}$

5x² -15x -20

5x² +5x -20x -20

5x (x +1) -20 (x+1)

(5x-20) (x+1)

5 (x-4) (x+1)

hence option A is correct ✔️

Hope it helps ❤