Which expression is equivalent to -4-9?

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Question:

Which expression is equivalent to -4-9?

Answer:

The expression that is equivalent to -4-9 is -4 + (-9).

The rule of arithmetic calculations state that when calculating algebraic expression;

plus sign multiplied by plus sign will remain positive

  • i.e. (+) × (+) = +

minus sign multiplied by a minus sign will be positive

  • i.e. (-) ×  (-) = +

plus sign multiplied by a minus sign will be negative

  • i.e (+) × (-) = –

The expression given is -4 – 9 = -13

Option (a)

  • -4 + (-9)

Recall that: (+) × (-) = –

Open brackets

= -4 – 9

= – 13

Option (b)

  • 4 + 9 = 13

Option (c)

  • -4 + 9 = 5

Option (d)

  • 4 – 9 = -5

Therefore, we can conclude that the expression that is equivalent to -4-9 is -4 + (-9).

They can hopefully assist the student deal with the question by using the questions and answer examples. Then could have some sharing in a group discussion and also learning with the classmate that is related to the topic, so another student also obtain some enlightenment and still keeps up the school learning.

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