The table below shows the lunch
menu at a local restaurant.
Menu
Item
Cheeseburger
French Fries
Choice Soda
Price
$1.89
$1.29
0.99
Marcus ordered 2 cheeseburgers,
1 French fries, and 1 soda for
lunch. The tax on his meal was
$0.48. Marcus paid for his lunch
with a $10 bill. How much
change will he receive?

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.