rozłożyć działanie na czynniki: (5p + 3q)^2 - 25 =
(5p+3q)^2 - 25 = [(5p+3q) + 5] * [(5p+3q) - 5]
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(5p+3q)^2 - 25 = [(5p+3q) + 5] * [(5p+3q) - 5]