Question

Simplify: (5x + 2y)² – (2x + 5y)²

Answer 1

Step-by-step explanation:

(5x)^2+(2y)^2+2×5x×2y-(2x^2+5y^2+2×2x×5x)

25x^2+4y^2+20xy-4x^2-25y^2-20xy

21x^2-21y^2.

Answer 2

Step-by-step explanation:

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