3m^2+4mn-5n^2+(-m^2)-6mn+2n^2+3mn-n ^2+3m^2+mn+4n^2

solution,

Collect like terms:

Simplify:

Hope this helps..

Good luck on your assignment..

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.

answer: this is not a question

step-by-step explanation: this is a answer