Atree cast a shadow that is 20 feet long. frank is 6 feet tall, and while standing next to the tree he cast a shadow that is 4 feet long.

a. how tall is the tree?

b. how much taller is the tree than frank?

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

just get this app called photo math it should be able to do those