Drag and drop the expressions into the boxes to correctly complete the proof of the polynomial identity.
(x² + y²)² + x4 + y4 = 2 (x4 + x²y² + y4)
(x² + y²)² + x4 + y4 = 2 (x4 + x²y² + y4)
+x4 + y4 = 2 (x4 + x²y² + y4)
= 2 (x² + x²y² + y4)
==2(x²+x²y² + y²4)