(7b^5 - 4b)(7b^5 - 4b)

The answer is b^2*(7b^4-4)^2

Step-by-step explanation: What you want to do is subtract 7b^5 from 7b^5 and you get 7b^4. Now that you've done that, you bring down the 2 b's you subtracted. Next, you're left with the 2 4'bs. What you want to do is subtract 4b from 4b, and your left with just 4.

answer: 24

step-by-step explanation:

7x2=14

5x2=10

10+14=24