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Question

Which of the following expressions has a constant?

A
3x
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B
x+5
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C
y
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D
ab+2a
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Solution

The correct option is B x+5
A constant is that whose value is fixed. It never changes.

In the expression x+5, 5 is a constant.

However in the expressions 3x, y and ab+2a, there are no constants.
(Note that, 3 in 3x is the coefficient of x, and not a constant.)

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