Question

How do you multiply `4r^3(2r^2-7r)`?

Answer 1

You distribute the 4`x^3` to the 2`r^2` and the 7r. Answer: 8`r^5`- 2`8r^4`.

Explanation:

More specifically, you multiply the 4 and the two together, for a total of 8, and then you add the powers of the two r terms. This would total 8`r^5` for the first term. Next, multiply the 4 and the 7 together, for 28, and then add the powers. This would total 7`r^4`. Put the two terms together and the answer is 8`r^5`- 2`8r^4`.