( X - 4 )( X + 5 ) - ( X - 40 ) = X2 + 5X - 4X - 20 - ( X - 40 ) = X2 + X - 20 - X + 40 = X2 + 20

HP CAS on HP 40gs The HP CAS system was created by Bernard Parisse of University de Grenoble for the HP 49g calculator. The same CAS Technology was later improved and adapted for inclusion on the HP 40g with the help of Renee De Graeve, Jean-Yves Avenard and Jean Tavenas. The HP CAS system offers the user a vast array of functions and abilities as well as an easy user interface which displays equations as they appear on the page.

The HP CAS system was created by Bernard Parisse of University de Grenoble for the HP 49g calculator. It was later implemented on the HP 48gII, HP 49g+, and HP 50g Graphing Calculators. The HP CAS system offers the user a vast array of functions and abilities as well as an easy user interface. It also includes the ability to display many algebraic calculations in ‘step-by-step’ mode, making it an invaluable teaching tool in universities and schools.

Why the HP50G is better than the TI89T The biggest advantage is RPN. Writing out very complicated or tedious equations is almost foolproof. You cannot know until you experience it. Another nice thing about 50G over the 89T is the functions and superfunctions on keys are MUCH easier to read than the 89Ts. On the 50G, the colors are white, yellow, and orange on a black background. The 89T uses light green, light blue, and silver on a grey background.

HP 20b Storage Memory Registers HP 20b has ten calculation memories available for use during calculations. These memories are numbered from 0-9. To store numbers, press [Shift][STO]. To recall the stored number, press [RCL]. You can use the store and recall functions for these memories any time a number is displayed, or when you wish to enter a number. To store a number in a memory: Key in a number.

HP StreamSmart Sound Probe The sound probe contains a microphone with variable capacitor. One of the capacitor’s plates is actually a sound-sensitive membrane, moving back and forth as sound waves resonate through it. This capacitor is connected serial to a resistor. When the capacitor is charged, and sound waves move the membrane, which is one of the capacitor plates, the distance between the plates change, the capacity of the capacitor changes and the voltage on the capacitor and on the resistance changes.

Quick and easy-to-use calculating solutions HP’s expanded calculator portfolio delivers HP reliability in convenient, easy-to-use solutions. New calculators include: HP OfficeCalc series - Stylish desktop offerings for simple calculations at users’ desks or sales counters; ideal for office or retail workers who need to quickly and accurately calculate items such as mark-up percentages, sales totals and taxes. HP PrintCalc - Ideal for small business owners that make quick calculations requiring receipts or documentation HP QuickCalc - Geared toward students and adults alike with a compact size that allows users to keep it handy for on-the-go calculations; available in fashionable colors and designed for quick and convenient access, it can attach to key chains and has magnetic backing to stick to refrigerators, file cabinets or any metal surface.

HP Calculators Redefine Style and Usability BERLIN, June 10, 2008 - HP today kicked off a new era of calculators by introducing the HP Business Consultant calculator, which boasts a sleek, modern design, while continuing in the HP heritage of technical innovation and product performance. The HP 20b Business Consultant is the first device based on the new HP calculator industrial design platform that unites style and usability to deliver visually distinct and meaningful elements across the company’s calculator lineup.