Answer: The answer is the third one: 2x^2 +7x -4
Step-by-step explanation:
You can remember this with FOIL method. You multiply the First values of each of the parenthesis. In this case it would be 2x * x = 2x^2. Then you multiply the Outer values, which is 2x * 4 = 8x. Then the Inner values, which is -1 * x = -x. Finally, you do the Last values, which are -1 * 4 = -4. We now have 2x^2 + 8x - x - 4. We simplify this and get 2x^2 + 7x - 4.
