Tiana solved the equation -2(3x - 5) = 4(x + 3) + 8. When
she double checked her work
by substituting, it made the
equation untrue.

actually when I solved it ,the equation is true

Step-by-step explanation:

look

-2 (3x - 5) = 4(x + 3) + 8

-6x + 10 = 4x + 12 + 8

-6x + 10 = 4x + 20

-6x - 4x = 20- 10

-10x = 10

x = -1

and when I substitute, I get 16 on both sides so I don't know where the problem is

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

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