$x=(\frac{?}{\text{b}\text{a}\text{r}}(B)+C)(A\frac{+}{b}ar(B))(\frac{?}{\text{b}\text{a}\text{r}}(A)+B)$

Show how the above Boolean algebra can be changed so

that $x$ can implemented using $5$ NOR gates with two

inputs each and one three input NOR gate.