Calculate the average speed of a complete round trip in which the outgoing 300 km is covered at 97 km/h, followed by a 1.0-h lun
1 answer:
You might be interested in
You can't have a negative number under a radical that has an even index. We have an even index since we are dealing with the square root. Because of that we have to get the imaginary i involved. 
. Keeping that in mind, let's rewrite our problem: 
. If -1 equals i-squared, we can sub that in. Also, since 8 = 4*2 and 4 is a perfect square, let's break that down at the same time: 
. i-squared is a perfect square which can be pulled out as a single i, and 4 is a perfect square which can be pulled out as a 2. We will leave a 2 under the radical. Here's your simplification: 
, choice C from above.