4. (a) Subtract 4a - 7ab + 3b + 12 from 12a-9ab + 5b - 3
(b) Subtract 3xy + 5yz - 7zx from 5ry - 2yz - 2zx + 10.xyz
(c) Subtract 4pq - 3pq + 5pq? - 8p + 79 - 10 from
18 - 3p - 1lq + 5p -2pq+ 5pqdon't take subject of marks
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Answer:
(1)
subtract 4a−7ab+3b+12 from 12a−9ab+5b−3
=12a−9ab+5b−3−(4a−7ab+3b+12)
=12a−9ab+5b−3−4a+7ab−3b−12
=8a−2ab+2b−15
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