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(-3a² - 9a) - (a²+5a)
-3a² -9a - a² -5a
-3a²-a²-9a-5a
-4a²-14a
17.
(4x²+2x-7)-(x²+3x+2)
4x²+2x-7-x²-3x-2
4x²-x²+2x-3x-7-2
3x²-x-9
=-3A²+5A-(-3A²)(-9A)
=-3A²+3A²+5A+9A
=-3A²+14A
17.X²+3X+2dari 4X²+2X-7
=X²+3X+2-4X²+2X-7
=X²-4X²+3X-2X+2-7
=3X²-X-9