1) (c²-9)-(c²-16)= c²-9-c²+16= 7
2) (49c²-4)-(49c²-25)= 49c²-4-49c²+25= 21
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1) (c²-9)-(c²-16)= c²-9-c²+16= 7
2) (49c²-4)-(49c²-25)= 49c²-4-49c²+25= 21