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Question

Which among the following expression on simplification gives a binomial?

A
4x+6y3x+5y+7z
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B
5x(8z9y)
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C
2x+3y4x3y
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D
7x(2a+3b+4c)
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Solution

The correct option is B 5x(8z9y)
In option (a.), we have 4x+6y3x+5y+7z
Combining the like terms:
4x+6y3x+5y+7z
=(4x3x)+(6y+5y)+7z
=x+11y+7z

x+11y+7z cannot be simplified further as it contains all the unlike terms in it.
The simplified form of 4x+6y3x+5y+7z is x+11y+7z, i.e. a trinomial.


In option (b.), we have 5x(8z9y)
Simplifying the product:
5x(8z9y)=(5x×8z)(5x×9y)
=40xz45xy

40xz45xy cannot be simplified further as it contains all the unlike terms in it.
The simplified form of 5x(8z9y) is 40xz45xy, i.e. a binomial.


In option (c.), we have 2x+3y4x3y
Combining the like terms:
2x+3y4x3y
=(2x4x)+(3y3y)
=2x+0
=2x

The simplified form of 2x+3y4x3y is 2x, i.e. a monomial.


In option (d.), we have 7x(2a+3b+4c)
Simplifying the product:
7x(2a+3b+4c)
=(7x×2a)+(7x×3b)+(7x×4c)
=14ax+21bx+28cx

14ax+21bx+28cx cannot be simplified further as it contains all the unlike terms in it.
The simplified form of 7x(2a+3b+4c) is 14ax+21bx+28cx, i.e. a trinomial.

Therefore, option (b.) is the correct answer.

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