A) (-p²-q²+1) + (-9+p²+q²)= -p²-q²+1-9+p²+q²= -8
B) (7mk-3m+4k) - (-5k+4m-mk)= 7mk-3m+4k+5k-4m+mk= 8mk-7m+9k
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A) (-p²-q²+1) + (-9+p²+q²)= -p²-q²+1-9+p²+q²= -8
B) (7mk-3m+4k) - (-5k+4m-mk)= 7mk-3m+4k+5k-4m+mk= 8mk-7m+9k