You have a truck with two gas tanks. the volume of the larger tank is "8x2 2x − 1" in3 and the volume of the smaller tank is "7x2 − 2x 1" in3. find a single expression that represents the capacity of both gas tanks combined

To express the volume of both trucks in a single expression, we add the expressions,
                                      8x² + 2x - 1
and also,
                                      7x² - 2x + 1
Adding the corresponding terms in the expressions will give us an answer of,
                                    15x² 
Thus, the volumes of the trucks in a single expression is 15x².