Help me Please.

(2x^1/4y¹) (4x^-3/4y⁴)  =

[2 * 4] *  [ x^1/4 * x^-3/4 ]  * [ y¹ * y ⁴ ]  =

8  *  [ x ^{1/4 - 3/4} ] *  [  y ^{1 + 4} ]  =

8 * [ x ^-2/4 [ * [ y ⁵ ]  =

8x^-1/2y⁵