Question

if a + b + C is equal to 4 then a cube plus b cube plus c cube - 12 c square + 48c - 64 is equal to​

Answer 1

Answer:

a^3+b^3+c^3-12c^2+48c-64

=a^3+b^3-(c^3+12c^2-48c+64)

=a^3+b^3-(4-c)^3

=a^3+b^3-(a+b)^3

=-3ab(a+b)