Which function is a linear function? A. 1 − 3x2 = -y B. y + 7 = 5x C. x3 + 4 = y D. 9(x2 − y) = 3 E. y − x3 = 8

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.

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8