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b) (5 - xy²)²= 25 - 50x²y⁴ + x²y⁴
c) (2 1/5 -y)(2 1/5 +y)= 4.84 - y²
b) (5 - xy²)² =25-10xy²+x²y4
c) (2 1/5 - y)(2 1/5 + y) =4,84-y²
b)=10-5xy⁴+2xy⁴
c)=4¹/₂₅+2¹/₅y-2¹/⁵y-y²=4¹/₂₅-y²