I already know y = 8, but I have no idea what the rest of the answers are, please help.

See image

Step-by-step explanation:

If you put the 8 in for y, then all of a sudden, hurray there's enough info to keep going. It is an isosceles triangle which means two sides are the same. That also means that the two angles opposite the two equal sides are also equal. That's how we know the unmarked angle is also 4x

"Triangle Angle Sum" means to use the fact that all the angles in a triangle added up equals 180°. So add up all the angles, set equal to 180 and solve. To find the angle measures just pop in the x=18 to calculate. See image.

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.