ACT SAT PREP - Functions with Absolute Value

The video tutorial explains how to solve an equation by substituting X with -5. It highlights common mistakes when squaring negative numbers and demonstrates the correct calculation using absolute values. The tutorial emphasizes the importance of understanding the substitution process and provides a step-by-step guide to avoid errors.

What is the first step when evaluating F(-5) for a given function F(x)?

• Multiply the function by -5

• Divide the function by 5

• Add 5 to the function

• Replace X with -5 in the function

Why is it incorrect to input -5 squared directly into a calculator?

• It gives a result of zero

• Calculators cannot handle negative numbers

• It only squares the 5, not the negative sign

• It results in a positive number

What is the result of squaring -5?

• -25

• 5

• 0

• 25

What is the purpose of using absolute value in the final calculation?

• To make the result negative

• To ensure the result is positive

• To double the result

• To halve the result

What is the final answer when evaluating F(-5) in the given function?

• 25

• -25

• 0

• 50