Arectangular plot of ground measuring 12 meters by 20 meters is surrounded by a sidewalk of a uniform width. the area of a sidewalk is 68square meters what is the width of the sidewa; l

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

step-by-step explanation:

there's the chart