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Question
Subtract:
5a + 7b − 2c from 3a − 7b + 4c
Solution
Change the sign of the term of the expression that is to be subtracted and then add.
Term to be subtracted = 5a + 7b − 2c
Changing the sign of each term of the expression gives -5a -7b + 2c.
On adding:
(3a − 7b + 4c)+(-5a -7b + 2c ) = 3a − 7b + 4c-5a -7b + 2c
= (3-5)a+( − 7-7)b + (4+2)c
= -2a − 14b + 6c
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