When wrapping a birthday gift in the shape of a rectangular prism for his mother, Kenji adds an additional 2.5 square inches of gift wrap to allow for overlap. How many square inches of
gift wrap will Kenji use to wrap a gift 3.5 inches long, 18 inches wide, and 2 inches?

answer: the four apples you took away.

step-by-step explanation:

faster, im not sure why but i know it is faster

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb