Can someone explain problems 2B-7 a & b. I've reviewed the answer and it doesn't make sense to me. I'm missing a concept here.
MIT 18.01 Single Variable Calculus (OCW)
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
If f(x) is increasing at a given point, then the slope at that point has two forms it could be in. Either y and x are both positive, or y and x are both negative. If y and x are both negative, then the negatives on the top and bottom of the fraction cancel, and the slope is still positive.
Therefore, when f(x) is increasing, the slope is always positive (or zero, as you will see shortly, hopefully). The derivative gives us a method to calculate the slope at a given point, hence, if f(x) is increasing, the derivative at that given point is positive. Since the limit of a continuous function is the same as the derivative at a given point, you can use the limit to prove this.
For part b, x to the third power has an inflection point, a point were the function is increasing, and then for one instance goes horizontal and has slope of zero. It's just one point. Then it increases again. The function is said to be increasing at this inflection point because it does not decrease. It simply goes from increasing, to horizontal for one instantaneous point, and then increasing again.
Thank you for your explanation. When I revisited the problem with your explanation, it help connected the dots.