Factor completely -4x^2-28x-48

first factor out -4

-4(x^2 + 7x + 12)

then you can factor what is in parenthesis

-4(x+4)(x+3)

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5