add the following algebraic expressions. 20a + b -c,a - 20b + c and a + b - 20c
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Answer: 22a-18b-20c
Cancel +c and -c, then it is -20c
Add +b and +b,it is 2b subtract with -20c, it is -18b.
Add a and a, it is 2a, then add 20a, it is 22a.
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Add the following algebraic expression (i) 20a+b-c, a-20b+c and a+b-20c
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