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15x is a variable.

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Important Questions on Algebraic Expressions

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7th CBSE
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There are three terms in the expression xyz.

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Like terms can have different variables.

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5xy and 5pq are like terms.

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The coefficient of 2x3y in the term 12x3y2z is 6yz.

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At x=1, the value of algebraic expression 12x3-10x2+5x-9 is 2.

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The value of an algebraic expression does not change with the change in the value of the variable.

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7th CBSE
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2x+3y is a binomial.
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7th CBSE
IMPORTANT
6xyz is a trinomial.