Ill give brainliest and explain the answer too,

8x²+19x+3

Step-by-step explanation:

You add together the like terms. In this problem, 3x² and 5x² are like terms, so you add them together to get 8x². 7x and 12x are like terms, add them to get 19x. 3 does not have any like terms so you dont do anything to it.

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.