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3x² + x + 2
2ab - 3bc + 5ab - 4bc
7ab - 7bc
yang C cari sendiri :)
a.4x² - x² +x +2=3x²+x+2 itu -x²sama aja -1x2²
b.2ab+5ab-3bc-4bc=7ab-7bc
c.-2.2x² + (-2).3x -2.-4
=-4x²+-6x+8