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Addition and Subtraction of Algebraic Expressions

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Question

Add the following:
(i) 3x and 7x
(ii) −5xy and 9xy

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Solution

We have
(i) 3x + 7x = (3 + 7)x = 10x
(ii) -5xy + 9xy = ( -5 + 9)xy = 4xy

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