# Casio FX-991 EX classwiz calculator tutorial (perfect for algebra, FE exam, EIT exam)

TLDRThis tutorial showcases the Casio FX-991 EX classwiz calculator, ideal for algebra and engineering exams. It demonstrates solving quadratic equations, systems of equations, complex numbers, logarithms, inverse sine, summation, derivatives, and integrals. Viewers are encouraged to participate in a giveaway by subscribing and commenting for a chance to win a calculator by December 31st, 2016.

### Takeaways

- ๐ The video is a tutorial for using the Casio FX-991 EX classwiz calculator, suitable for algebra and engineering exams.
- ๐ The presenter is giving away a calculator; viewers have a chance to win it by following the video's instructions.
- ๐ฐ The price of the calculator at Target, after tax, is approximately $21.
- ๐ The calculator can solve quadratic equations and provides the roots and vertex of the parabola.
- ๐ For solving systems of equations, the calculator requires the user to input coefficients and constants correctly aligned.
- ๐ข The calculator handles complex numbers, allowing users to perform operations in complex mode.
- ๐ The device supports various mathematical functions, including logarithms with customizable bases.
- ๐ To switch between modes, such as from complex to standard calculation, the menu and 'calculate' buttons are used.
- ๐ The calculator can find the inverse sine of a fraction and switch between degree and radian modes.
- ๐ It can perform summation and differentiation, providing values for the derivative at a given x.
- ๐ The integral function calculates the area under a curve for a specified range of x values.

### Q & A

### What is the brand and model of the calculator featured in the video?

-The calculator featured in the video is a Casio FX-991 EX classwiz.

### What is the approximate cost of the calculator at Target after tax?

-The approximate cost of the calculator at Target after tax is about $21.

### How can viewers participate in the giveaway to win a calculator?

-Viewers can participate in the giveaway by subscribing to the channel and writing a comment on the video, with the winner being the one with the most likes on their comment by December 31st, 2016.

### How does the calculator solve quadratic equations?

-The calculator solves quadratic equations by requiring the user to enter the equation in standard form with the right-hand side equal to zero, then selecting the degree of the polynomial and entering the coefficients.

### What additional information does the calculator provide for quadratic equations?

-The calculator also provides the vertex of the parabola, which includes the minimum or maximum point (depending on the parabola's orientation) and the corresponding y-value.

### How does the calculator handle systems of equations?

-The calculator solves systems of equations by allowing the user to enter the coefficients of each variable and the constants on the right-hand side of the equations.

### What is the process for entering complex numbers on the calculator?

-To enter complex numbers, the user must first switch to complex mode using the menu, then use the 'i' button for the imaginary unit, and enter the real and imaginary parts using the fraction key.

### How can the calculator be used to find the logarithm of a number with a specific base?

-The calculator allows the user to set the base for logarithms using a specific button, then enter the base and the number for which the logarithm is desired.

### What is the purpose of the 'inverse sign' function on the calculator?

-The 'inverse sign' function is used to find the angle whose tangent is the given number, expressed in degrees or radians.

### How does the calculator handle summation and derivatives?

-The calculator can perform summation by entering the function and the limits of summation. For derivatives, the calculator requires the function and a specific value of x to provide the derivative at that point.

### What is the process for calculating integrals on the calculator?

-To calculate an integral, the user enters the function under the integral sign and specifies the limits of integration.

### Outlines

### ๐ Scientific Calculator Tutorial

This paragraph introduces a tutorial on using a scientific calculator to solve various mathematical problems. The speaker demonstrates how to solve a quadratic equation using the calculator's equation-solving mode, including finding the vertex of the parabola. The process involves selecting the appropriate menu options, entering coefficients, and interpreting the results. Additionally, the speaker mentions a giveaway of a calculator and encourages viewers to watch the entire video to participate.

### ๐ Calculator Giveaway and Advanced Functions

The second paragraph continues the theme of the scientific calculator, showcasing its advanced functions such as solving systems of equations, working with complex numbers, calculating logarithms with custom bases, finding inverse sine values, and performing summation and derivative calculations. The speaker also explains how to switch between different calculator modes and units, such as degrees and radians. The paragraph concludes with details on a giveaway contest, where viewers can win a calculator by subscribing to the channel and leaving a comment with the most likes by a specified date.

### Mindmap

### Keywords

### ๐กScientific Calculator

### ๐กQuadratic Equation

### ๐กPolynomial Equation

### ๐กVertex

### ๐กSystem of Equations

### ๐กComplex Numbers

### ๐กLogarithm

### ๐กInverse Sine

### ๐กSummation

### ๐กDerivative

### ๐กIntegral

### Highlights

Tutorial for using the Casio FX-991 EX classwiz calculator for algebra and engineering exams.

The calculator is available at Target for approximately $21 after tax.

A giveaway is being held for a chance to win a calculator by watching the video until the end.

Demonstration of solving quadratic equations using the calculator's menu options.

Explanation on entering equations in standard form for calculation.

How to find the vertex of a parabola using the calculator.

Guide on solving systems of equations with multiple variables.

Instructions for dealing with missing variables in equations.

Complex numbers calculation using the calculator's complex mode.

How to change the calculator's mode for different mathematical functions.

Using the calculator to find the logarithm with any base.

Explanation of inverse sine calculation and changing between degrees and radians.

Summation calculation on the calculator with specific ranges for 'x'.

How to find the derivative of a function using the calculator.

Integral calculation on the calculator with specified ranges.

The importance of subscribing to the channel and participating in the comment section for the giveaway.

Details on how to increase the chances of winning the calculator by commenting and sharing the video.

Encouragement for viewers to continue engaging with the channel for more educational content.

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