What is the solution set?

−2.8x+5.6<8.4

yes

Step-by-step explanation:

x>−1

Step-by-step explanation:

−2.8x+5.6<8.4

Subtract 5.6 from both sides.

−2.8x<8.4−5.6

Subtract 5.6 from 8.4 to get 2.8.

−2.8x<2.8

Divide both sides by −2.8. Since −2.8 is negative, the inequality direction is changed.

x>  −2.8 / −2.8

​Divide 2.8 by −2.8 to get −1.

x>−1

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.