Which of the following is the solution of the given system of equations?
2x + 2y + z = -12

x + z = 20

x = 1

a) (1, -33/2, 19 )

b) ( 1, 33/2, 19)

c) (1, -17, 19)

d) (1, -25, 21)

the expected value of the random variable : 0, 1 and 2

step-by-step explanation:

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.