Which of the binomials below is a factor of this trinomial 5x^2+20x+15

Answer: (x+1) is what I answered on apex

I do not see any binomials, but here is how to factor "5x^2+20x+15" so you can get the right binomials:

5x^2 + 20x + 15

= 5 (x^2 + 4x + 3)

= 5 (x^2 + x + 3x + 3)

= 5[ (x^2 + x) + (3x + 3) ]

= 5[x (x + 1) + 3 (x + 1) ]

= 5[ (x + 1) (3x + 3) ]

= 5 (x + 1) (3x + 3)