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4x2-5xy-y2
2. -3p2-10p2+15p-5p-6-55
-13p2+10p-61
=4x pngkt 2 - 2xy + 2y pngkt 2 - 3xy - 3y pngkt 2
=4x pngkt 2 - 5xy + 2y pngkt 2 - 3y pngkt 2
=4x pngkt 2 - 5xy - y pngkt 2
(maaf sy pke hp jdi penulisannya pke pngkt 2) :-D