Find the factors.
5x2 + 21xy – 20y2
5x2 + 21xy – 20y2
⟹ 5x2 – 25xy + 4xy – 20y2
⟹ 5x(x – 5y) + 4y(x – 5y)
⟹ (5x + 4y) (x – 5y)
So (5x + 4y) and (x – 5y) are the factors of the given polynomial.
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