Rewrite (5x⁵ - y)² as:
(5x⁵ - y)*(5x⁵ - y)
Use distributive property:
(5x⁵*5x⁵)+(5x⁵*(-y))+((-y)*5x⁵)+((-y)*(-y))
25x¹⁰ - 5x⁵y - 5x⁵y + y²
25x¹⁰ -10x⁵y + y²
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