Ricardo is buying some copier paper. The equation below shows the relationship between x, the number of packages of paper he buys, and y, the cost for the paper. 3. How many packages of paper can Ricardo purchase for $40?

A
20 packages
B
50 packages
C
80 packages
D
32 packages
.

we need the options

step-by-step explanation:

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.