What is the opposite of 2.5

The opposite of 2.5 is -2.5.

Step-by-step explanation:

Hi, to answer this question we have to understand what is the opposite number of a number.

The opposite number of a certain number is the same number but in the negative form (if the original number is a positive number ).

In this case, the opposite of 2.5 is -2.5.

Feel free to ask for more if it´s necessary or if you did not understand something.

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.