A blog is that is all about mathematics and calculators, two of my passions in life.
Sunday, January 31, 2016
Tuesday, January 26, 2016
Video: The F.O.I.L. Technique in Algebra
The F.O.I.L. Technique in Algebra
An efficient way of multiplying two binomials (x + y)*(a + b)
https://www.youtube.com/watch?v=n35ZLJzAu1A
Eddie
An efficient way of multiplying two binomials (x + y)*(a + b)
https://www.youtube.com/watch?v=n35ZLJzAu1A
Eddie
Monday, January 25, 2016
Video: Combinations vs Permutations
This short video explains the difference between combinations and permutations.
Link: https://www.youtube.com/watch?v=Pj3sowlVbec
Eddie
Link: https://www.youtube.com/watch?v=Pj3sowlVbec
Eddie
Change of Plans
Apparently, someone on YouTube, maybe the company itself, doesn't like algebra. Who knew talking about the F.O.I.L. method was so offensive? I am appealing the decision.
For the time being, I will probably cease making videos until this matter is resolved (I expect it to be in my favor, but who knows).
Eddie
Update: YouTube restored my FOIL video and I am back in good standing. Happy dance! Eddie
For the time being, I will probably cease making videos until this matter is resolved (I expect it to be in my favor, but who knows).
Eddie
Update: YouTube restored my FOIL video and I am back in good standing. Happy dance! Eddie
Sunday, January 24, 2016
Math Videos and Update
Sample Slide 
Over the next few weeks I am going to working several short math videos that I will post on YouTube. When each video is completed, I will leave a link to that video on this blog.
The videos are going to be pretty short covering various topics in mathematics.
I hope you enjoyed the HP 15C programs posted over the last two weeks. I plan to continue to post programs for various calculators this year.
I thank you for the comments and reviews. Talk to you next time, and be safe everyone,
Eddie
Thursday, January 14, 2016
HP 15C: Approximate Length of Sunlight During a Day
HP 15C: Approximate Length of Sunlight During a Day
For the HP
35S version, please click here:
Source: Total
Daily Amount of Solar Radiation  HP 67/97 Energy Conservation Pac, December
1978, Author: Hewlett Packard
Instructions:
Y
Stack: Enter the latitude (North as
positive, South as negative). Use the
D.MMSS (degreesminutesseconds) format
X
Stack: The number of days after March
21. A 365 day year is assumed, as well
as assuming March 21 is the vernal equinox.
Run the
program.
This is an
approximation.
Program:
Step

Key

Key Code

001

LBL E

42, 21, 5

002

DEG

43, 7

003

.

48

004

9

9

005

8

8

006

5

5

007

6

6

008

*

20

009

SIN

23

010

2

2

011

3

3

012

.

48

013

4

4

014

5

5

015

*

20

016

X<>Y

34

017

>H

43, 2

018

TAN

25

019

X<>Y

34

020

TAN

25

021

CHS

16

022

*

20

023

COS^1 (ACOS)

43, 32

024

>RAD

42, 3

025

2

2

026

4

4

027

*

20

028

Ï€

43, 26

029

÷

10

030

>H.MS

42, 2

031

RTN

43, 32

Example:
Los Angeles,
April 17. Latitude of 34°03’ N, 27 days
after March 21.
Result: approximately 12.5735 (12 hours, 57 minutes,
35 seconds)
Sydney, June
21. Latitude of 33°51’31” S (enter as
33.5131), 92 days after March 21.
Result: approximately 9.4439 (9 hours, 44 minutes, 39
seconds)
Rome,
September 1. Latitude of 41°51’ N, 164
days after March 21.
Result: approximately 12.5323 (12 hours, 53 minutes,
23 seconds)
This blog is
property of Edward Shore. 2016
HP 15C: Soderberg’s Equation for Fatigue
HP 15C:
Soderberg’s Equation for Fatigue
Source: Step by Step Solutions for your HP
Calculator: Engineering Applications.
HP32S. Hewlett Packard. Corvallis, OR. 1988
pg. 5254
Equation:
Syp/FS =
(Smax + Smin)/2 + K * (Syp/Se) * ((Smax – Smin)/2)
Variables:
R0 = Syp =
yield point stress
R1 = Se =
endurance stress reversed bending tests
R2 = Smax =
maximum applied stress
R3 = Smin =
minimum applied stress
R4 = K =
stress concentration factor
R5 = FS =
factor of safety
Instructions:
Enter the
known values in each of the variables.
Enter the number of the variable to be solved in register I ( [ STO ] [
TAN ] (I) ). To solve, enter a range,
and press [ f ] [ ÷ ] (SOLVE), [ e^x ] (B). (*or whatever label you assigned
this program to)
Program:
Step

Key

Key Code

001

LBL B

42, 21, 12

002

STO (i)

44, 24

003

RCL 0

45, 0

004

RCL÷ 5

45, 10, 5

005

RCL 2

45, 2

006

RCL+ 3

45, 40, 3

007

2

2

008

÷

10

009



30

010

RCL 2

45, 2

011

RCL 3

45, 30, 3

012

2

2

013

÷

10

014

RCL* 0

45, 20, 0

015

RCL÷ 1

45, 10, 1

016

RCL* 4

45, 20, 4

017



30

018

RTN

43, 32

Example:
Find the
yield point (R0) given the following:
R1 = Se =
33,000 psi
R2 = Smax =
20,000 psi
R3 = Smin =
10,000 psi
R4 = K = 1.5
R5 = FS = 2
Store 0 in
RI.
Solution: 55,000 psi
This blog is property of Edward Shore. 2016
Subscribe to:
Posts (Atom)
TI74: Extrema of a Cubic Polynomial
TI74: Extrema of a Cubic Polynomial Introduction The program finds the extrema points of a cubic polynomial where the roots A, B,...

Casio fx991EX Classwiz Review Casio FX991EX The next incarnation of the fx991 line of Casio calculators is the fx991 EX. ...

One of the missing features of the TI82/83/84 family is the ability to convert between bases. Here are two programs in TIBasic to help...

TI36X Pro Review This is a review of the TI36X Pro Calculator by Texas Instruments. History Originally, this was the TI30X Pro that w...