What is the answer? please be detailed as possible I need this done asap

a7=36

Step-by-step explanation:

a1=12

a2=a1+4=16

a3=a2+4=20

an=4×(n+2)

a7=4×(7+2)=4×9

a7=36

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb