a ) \(16x^3-54y^3=2\left(8x^3-27y^3\right)=2\left[2x-3y\right]\left(4x^2+6xy+9y^2\right)\)
b ) \(5x^2-5y^2=5\left(x^2-y^2\right)=5\left(x-y\right)\left(x+y\right)\)
c ) \(16x^3y+yz^3=y\left(16x^3+z^3\right)\)
d ) \(2x^4-32=2\left(x^4-16\right)=2\left(x^2-4\right)\left(x^2+4\right)=2\left(x-2\right)\left(x+2\right)\left(x^2+4\right)\)