The function f(x) = -x - 4x + 5 is shown on the graph. which statement about the function is true? the domain of the function is all real numbers less than or equal to -2. the domain of the function is all real numbers less than or equal to 9. the range of the function is all real numbers less than or equal to -2 the range of the function is all real numbers less than or equal to 9.

answer;

the correct answer

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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.