Please help me i cannot figure it out

6z +3 - 2z +5=
this is what i cannot figure out

4z+8

Step-by-step explanation:

combine your like terms

6z-2z=4z

3+5=8

the answer is 11.2 (i know i’m late)

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