Algebra: A Combined Approach (4th Edition)

$3$
$-5+8$ This expression is the same as $8-5=3$ Remember, with different signs, subtract the absolute values, and then apply the sign of the larger absolute value. The absolute values of the above terms would be: 8 and 5, whose difference is 3, and the sign of the greatest absolute value is positive, so the answer is 3.