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Addition and Subtraction of Algebraic Expressions

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Question

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(iii) The sum of -15 and -4 = and the sum of -15x and -4y =

-15x-4y

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-19

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Solution

Sum of -15 and -4 $= (- 15) + (- 4)$
$= - 15 - 4$
$= - (15 + 4)$
$= - 19$

Sum of -15x and -4y
Since -15x and -4y do not have the same literals, we cannot add them.
$∴$ Sum of -15x and -4y $= (- 15 x) + (- 4 y)$
$= - 15 x - 4 y$

Hence, the sum of -15 and -4 is -19 and the sum of -15x and -4y is -15x -4y.

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- 2 and - 5 =

- 2 x and - 5 x =

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a_{1} + a_{5} + a_{10} + a_{15} + a_{20} + a_{24} = 225

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