2.1.4.10 LAB: Operators and expressions

LAB 

Estimated time

10-15 minutes

Level of difficulty

Easy

Objectives

• becoming familiar with the concept of numbers, operators, and arithmetic operations in Python;
• performing basic calculations.

Scenario

Take a look at the code in the editor: it reads a float value, puts it into a variable named x, and prints the value of a variable named y. Your task is to complete the code in order to evaluate the following expression:

3x³ - 2x² + 3x - 1

The result should be assigned to y.

Remember that classical algebraic notation likes to omit the multiplication operator - you need to use it explicitly. Note how we change data type to make sure that x is of type float.

Keep your code clean and readable, and test it using the data we've provided, each time assigning it to the x variable (by hardcoding it). Don't be discouraged by any initial failures. Be persistent and inquisitive.

Test Data

Sample input

x = 0 x = 1 x = -1

Expected Output

y = -1.0 y = 3.0 y = -9.0

output

•  Sandbox

1

2

3

4

x = # hardcode your test data here

x = float(x)

# write your code here

print("y =", y)

• Console