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b) -8x²y - 36 xy - (-7xy - 14x) = -8x²y - 36xy +7xy + 14x = =8x²y - 29xy + 14x
7x - 6y + 8 + (-3x+11y-4) = 7x - 6y + 8 - 3x+11y - 4 = 4x + 5y + 4
B . -7x(y+2) dari -4xy(2x+9) = -4xy (2x+9) - (-7x) (y+2) = -8ײy - 9×y - -7xy + - 14× = -8x²y - 2xy - 14 x
C. (7x -6y+8) dan (-3x+11y-4) = 7x -6y + 8 + -3x + 11y - 4 = 4x + 5y + 4