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My name is Larry Feldman, and I specialize in making complex material understandable to a mass audience. I have a MSEE and over twenty years of applied mathematics and teaching experience. I firmly believe that every person has the ability to comprehend mathematics as long as the material is presented in the right way. Most complicated problems can be broken down into simpler components. I create
12/06/2024
https://youtu.be/gQwMEnt_p3Y?si=SHoZvNPVaVN_YgWb
Write Equation of Line (WEL) Perpendicular This video has no sound. You're not missing much as my handwriting is as mediocre as my voice. I recommend listening to your favorite music while watching,...
12/04/2024
https://youtu.be/YGYrBBntIIQ?si=g8pDlglhzaSAiZd8
Simplifying Exponents This video has no sound. You're not missing much as my handwriting is as mediocre as my voice. I recommend listening to your favorite music while watching,...
12/26/2020
What’s the line 2x+5y=20 cuts the x-axis at A and the y-axis at B mean? Larry Feldman's answer: It’s asking you/me to find the x-intercept at (A, 0) and the y-intercept at (0, B). By letting x = A and y = 0 in the equation of the line, we get: 2A = 20 A = 10 Then let x = 0 and y = B in the equation: 5B = 20 B = 4
05/02/2020
In which quadrant does θ lie if the following statements are true: cot θ > 0 and cos θ> 0? Larry Feldman's answer: The easiest way to answer these types of questions, in my opinion, is to remember that cot equals x/y and cos equals x on the unit circle. If cot > 0, then x/y > 0. That’s only possible if x and y have the same sign, which occurs in quadrants 1 and 3. If cos > 0, then x ...
10/29/2019
What is the equation of the perpendicular bisector of the line joining the point (3,8) and (2,-5)? Larry Feldman's answer: I’ll give you some hints. Call the given points A and B. Find the midpoint of AB. Call it (h, k). Find the slope of AB. Call it m. The equation is: y - k = -\frac{1}{m}(x - h). The rest is up to you.
09/04/2019
How do you change a standard form equation into slope-intercept form? Larry Feldman's answer: Ax + By = C By = C - Ax y = (C/B) - (Ax/B) y = (-A/B)x + (C/B)
04/10/2019
What is the asymptote of a logarithmic function? Larry Feldman's answer: If y = a log(bx - c) + d is your log function, bx - c is called the “argument.” The vertical asymptote is the line whose x coordinates make the argument 0. Those x values are prohibited because you can’t take the log of 0. Setting the argument to 0: bx - c = 0 bx = c .....
03/06/2019
What is the value of \displaystyle \frac{d}{dx}\int_0^{x^2}\sqrt{1+t^2}dt? Larry Feldman's answer: Using the 2nd Fundamental Theorem of Calculus: 2x\sqrt{1 + x^4}
02/16/2019
Is it true that one chance in 10^50 can never happen? Larry Feldman's answer: It’s not true, especially if the experiment is repeated a ton. Assume a random variable follows a binomial distribution where: n = number of trials k = number of successes p = probability of success in any given trial P(k) = probability of k successes Then: P(k) = (...
What is the ratio of areas (Kite/Square) ? Given an isosceles triangle inscribed in a square with the same base and height, create a Kite... Larry Feldman's answer: I got 1/12.
01/16/2019
How do you find holes in rational functions? Larry Feldman's answer: Given rational function f(x) containing (x - k)^n in the numerator and (x - k)^m in the denominator: If n > m, there is a hole at (k , 0). If n = m, there is a hole at (k, g(k)), where g(x) is the simplified version of f(x). If n < m, there is a vertical asymptote at x ...
12/31/2018
What are the odds of winning at BINGO? Larry Feldman's answer: If there are N people each playing a single card, your probability of winning is 1/N. In other words, everyone has an equal chance. Your probability of losing is 1 - 1/N. So… Your odds of winning are 1/N : 1 - 1/N, which simplifies to 1 : N - 1.