Find all solutions y (real and otherwise) to the equation y8+16=17y4
y8−17y4+16=0(y4−16)(y4−1)(y2−4)(y2+4)(y2−1)(y2+1)=(y−2)(y+2)(y+2i)(y−2i)(y+1)(y−1)(y+i)(y−i)and thus roots at y=±2, ±2i, ±1, ±i
+116 
