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Addition of Algebraic Expressions

The sum of 5 ...

Question

The sum of 5z and 7z is

A

12

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B

12z

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C

2

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D

2z

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Solution

The correct option is B 12z
The terms 5z and 7z have same variable 'z' and this variable is raised the power of 1 in both the terms. Hence these terms are like terms.
Since like terms can be added, we can add 5z and 7z.
5z + 7z = z(5+7) = 12z

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