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-x^2 + 5xy
4x^2 - 4xy
------------------ (+)
(-x^2 +4x^2) + (5xy-4xy)
= 3x^2 + xy (dibaca 3 kali x pangkat 2 ditambah xy
jawaban b
8a + 4
3a - 5
----------- ( - )
(8a - 3a) + (4 - (-5))
= 5a + 9