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Answer:
+4a -1b +8c
Step-by-step explanation:
-a + 3b - 4c
4a - b + 9c
+a - 2b + 3c
= -a +4a + a [ minus and plus becomes minus ]
= +3a + a [ plus and plus becomes plus]
= +4a
= +3b - b -2b [minus and plus becomes minus ]
= +2b -2b [ sign of the greater number]
= -1b [ In integer zero is 1 ]
= -4c +9c +3c [ minus and plus becomes minus ]
= +5c + 3c [ plus and plus becomes plus] [ sign of greater number]
= +8c
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