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Question

Which of the following is an expression in one variable?

A
x2+2x+3
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B
5
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C
2x+3y
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D
x2+2y
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Solution

The correct option is A x2+2x+3
The expressions 2x + 3y and x2+2y, both have two variables, x and y.

The expression x2+2x+3 has one variable, which is x. Hence, it is an expression in one variable. The degree of this expression, or the highest exponent on x, is 2.

The expression 5 is a constant. It has no variables.

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