Geometry i need help now and could you tell me the name of the subject

Step-by-step explanation:

5, 7 and 8 are midsegments of the given triangle.

As per property, midsegment is parallel to one of the sides and is equal to its half by measure.

Midsegment with the length of 8 is parallel to side with the length of x and is half of its size:

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: check all that apply, where the options?

step-by-step explanation: