Choose all of the equations That have exactly one solution. A 2(x-4)=0
B. 7 + 3x = 11 + x
C. 5x -8= 7x +4- 2x
D. 3(2x - 1) = -3 + 6r
E. 8x - 5+ 4x = 7x - 5 - 9

i would need to see the dot plot : )

i think the answer is b

i think the length is 12 and the width is 17

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