Find the product of the following.
$(- 1)$ by $(- 4)$

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Solution

The product of two negative integers is a positive integer.
So we get,
$\begin{array}{rcl} (- 1) by (- 4) & = & (- 1) \times (- 4) \\ = & 4 \end{array}$
Thus, $(- 1) \times (- 4) = 4$

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