Question

17. Simplify each of the following
(1) (x + 3)^3 + (x – 3)^3​

Answer 1

Answer:

Step-by-step explanation:Remember the formula of (x+y)^3=x^3+y^3+3*x*y*(x+y) and (x-y)^3=x^3-y^3-3*x*y*(x-y).

Now, (x+3)^3+(x-3)^3= x^3+3^3+3*x*3*(x+3)+x^3-3^3-3*x*3*(x-3)

=x^3+9*x^2+27*x+x^3-9*x^2+27*x

=2*x^3+54*x