Evaluating Functions with the TI84 Plus CE

This video tutorial by Rob demonstrates how to evaluate functions at given values using the TI 84 Plus CE Graphing Calculator. It covers basic to complex problems, including those with negative numbers, square roots, fractions, and absolute values. The tutorial also shows how to convert decimals to fractions and vice versa. Rob provides step-by-step instructions and shortcuts for efficient calculations, making it a useful tool for checking homework or multiple-choice tests.

What is the primary purpose of using the TI 84 Plus CE technique as described in the video?

• To solve complex equations

• To graph functions

• To check homework answers or multiple-choice test answers

• To show each step of the process in detail

What is the first step in evaluating the function F(x) = 2x - 4 at x = 3?

• Highlight the function

• Press the clear button

• Enter the function into the calculator

• Store the value 3 into the variable X

How can you quickly evaluate the same function for different values of x?

• Clear the screen and start over

• Use the graphing feature

• Use the copy and paste function

• Retype the function each time

What is the result of evaluating the function F(x) = -4x^2 - 7x + 9 at x = 2?

• 9

• 0

• 21

• -21

How do you enter a fraction like 1/3 into the TI 84 Plus CE?

• Use the Alpha and y= buttons to access the fraction template

• Press the fraction button

• Use the decimal equivalent

• Type it directly

What is the decimal result of evaluating F(1/3) for the function F(x) = -4x^2 - 7x + 9?

• 6.3333333

• 6.1111111

• 6.4444444

• 6.2222222

What error message appears when evaluating F(x) = (x + 4) / sqrt(x + 2) at x = -2?

• Overflow Error

• Divide by Zero

• Syntax Error

• Domain Error

Why does the function F(x) = (x + 4) / sqrt(x + 2) result in an error at x = -2?

• The square root of a negative number is undefined

• The function is not properly entered

• The calculator cannot handle square roots

• The value of x is too large

What is the result of evaluating F(x) = |x + 1| / x at x = -2?

• -0.5

• 0.5

• 1

• -1

How can you convert a decimal result to a fraction on the TI 84 Plus CE?

• Press the fraction button

• Use the Alpha and y= buttons to access the fraction conversion

• Use the graphing feature

• Type the fraction manually