Question

Factor: 5x2 – 15x – 20

Answer 1

Answer:

5(x-4)(x+1)

Step-by-step explanation:

Solution:

5x2 – 15x – 20.

= 5(x2 – 3x – 4).

= 5(x2 – 4x + x – 4).

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

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

I hope it will help you...

Answer 2

Answer:

a=5,b=-15 ,c=-20

b2-4ac

75-(400)

= -325