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2. 2x.4 - 3.4 = 8x-12
3. mungkin soalnya begini;
(3x3 - 4x2 - 5x+6)x+2
(9 - 8 - 5x + 6)x+2
(9-8+6 - 5x)x+2
(7 - 5x)x+2
(7.x+7.2 - 5x.x+5x.2)
7x+9 - 5x^2+10x
7x+10x - 5x^2 + 9
-5x^2 + 13x + 9
hilangkan minus didepan, dgn mengalikan semua variable dgn min, jadi;
5x^2 - 13x - 9
semoga membantu, yg nomor 3 saya krg mengerti soalnya.