Diane received a $80 dollar gift card for a coffee store. she used it in buying some coffee that cost $8.14 per pound. after buying the coffee, she had $39.30 left on her card. how many pounds of coffee did she buy?

answer: all the values are within because it has a pattern that repeats from -6 to 4.

good luck!

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.