# Which expression is equivalent to -4-9?

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## Question:

Which expression is equivalent to -4-9?

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).

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