Answer:
2k(2+4k-a)
Explanation:
The common factor in all the terms is 2k, so you take that outside the bracket. Then, you divide 2k by each of the terms and write them in the given order to complete factorizing
The part of muscle that he needs to train is the Slow-twitch muscle fibers.
<h3>What are Slow-twitch muscle fibres?</h3>
The Slow-twitch muscle fibers are the muscle fibres that are used to support long distance endurance journey such as the marathon race.
Therefore, the part of muscle that he needs to train is the Slow-twitch muscle fibers.
Learn more about muscle here:
brainly.com/question/13920046
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