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SCORPION-xisa [38]
3 years ago
15

From 4a + 7b - 12c subtract 8a - 9b + 12d.

Mathematics
1 answer:
ollegr [7]3 years ago
8 0

Answer:

-4a + 16b -12c -12d

Step-by-step explanation:

Given:  From 4a + 7b - 12c subtract 8a - 9b + 12d.

We are given two algebraic expression. We can add/subtract only the like terms.

(4a + 7b  -12c) - (8a -9b +12d)

Now we have distribute the negative sign inside the second expression (8a -9b +12b). If we do, the sign changes.

4a + 7b -12c -8a + 9b -12d                                          [Sign rule: -(-) = +; -(+) = -]

Now we can combine the like terms

= (4a - 8a) +(7b + 9b) -12c -12d

= -4a + 16b -12c -12d

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