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2. -2(3x+4y-7) - 4(2x+y-9) = -6x-8y+14-8x-4y+36 = -6x-8x+14+36-8y-4y = -14x+50-12y
3. (3x-4y) (2x+y) = 3x.2x+3x.y-4y.2x-4y.y = 6x²+3xy-8xy-16y² = 6x²-5xy-16y²
4. maaf ya yg no 4 gk bisa