Question

add.
$-1 + (-2) = square$
$5 + (-5) = square$

Explanation:

Step1: Calculate \(-1 + (-2)\)

When adding two negative numbers, we add their absolute values and keep the negative sign. The absolute value of \(-1\) is \(1\) and the absolute value of \(-2\) is \(2\). So \(1 + 2 = 3\), and since both are negative, \(-1 + (-2)=- (1 + 2)=-3\).

Step2: Calculate \(5+(-5)\)

Adding a number and its additive inverse (opposite) results in zero. The additive inverse of \(5\) is \(-5\), so \(5+(-5) = 0\).

Answer:

For \(-1 + (-2)\), the answer is \(-3\); for \(5 + (-5)\), the answer is \(0\).