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terus jawabannya (16x²+16x+4)+(3x²-6) = 19x²+16x-2
16x² + 8x -8x -4
16x² -4
kemudian :
16x²-4 + 3x²-6
16x²+3x² -4-6
19x² -10
jadi hasilnya adl 19x²-10