Question

Evaluate the expression when $a=-2\text{and}b=-13$.

localid="1649144769525" $-a+\left(-b\right)$

Short answer

The value of the expressionis 15.

Step-by-step solution

Step-1 – Absolute value of a number

Absolute value of any positive or negative number is always positive and equal to the magnitude of the number. The absolute value of a number N is denoted by $\left|N\right|$.

The absolute value of a number represents the distance of the number from 0 in the number line.

Step-2 – Example of Absolute value

The absolute value of 3 is denoted by $\left|3\right|$and is equal to 3.

And the absolute value of $-4$is denoted by $\left|-4\right|$and is equal to 4.

Step-3 – Evaluate the expression

To evaluate the value of the expression $-a+\left(-b\right)$, substitute $-2$ for a and $-13$ for b and simplify further as shown below,

$\begin{array}{l}-a+\left(-b\right)=-\left(-2\right)+\left(-\left(-13\right)\right)\\ =2+\left(13\right)\\ =2+13\\ =15\end{array}$

Thus, the value of the given expression is 15.