Question

expand:

3x+2^3
answer is 27x^3 + 8 + 54x^3 + 36

27^3 and 8 will be but how 54x and 36 come


urgent needed

Answer 1

First a fall , you should know the identity - (a+b)^3 = a^3 +b^3 +3ab(a+b)

Then substitute the value of a = 3x and b= 2 in the identity.
You will get:
(3x)^3 + (2)^3 + 3(3x)(2) (3x+2)
= 27x^3 + 8 + (18x) (3x+2)
= 27x^3 +8 + 54x^2 + 36x is the answer.
hope you got it , all the best!!!

Answer 2

3x+2^3 can be written as (x+2)^3 . and that is in the form of formula (x+y)^3=x^3+y^3+3xy(x+y).
process out (x+2)^3 using the above equation and that will be.
(x+2)^3=x^3+2^3+3*x*2 * (x+2)
do this and u will get the answer.
hope it helps.
don't worry it is easy if u study the equations properly.