3/4 x
d / 3/4\ --\x / dx
Apply the power rule: x34x^{\frac{3}{4}}x43 goes to 34x4\frac{3}{4 \sqrt[4]{x}}44x3
The answer is:
3 ------- 4 ___ 4*\/ x
-3 ------- 5/4 16*x
15 ------- 9/4 64*x