Find the value of x.

74°

Step-by-step explanation:

60°+128°+95°=283°

The sum of all angles = 360°

360°-286°=77°

Edit : Typo

x = 77 degrees

Step-by-step explanation:

All angles of a trapezoid will add up to equal 360 degrees.

In other words: 60 + 128 + 95 + x = trapezoid

60 + 128 + 95 = 283 degrees.

360 - 283 = 77

x = 77 degrees

Check your work:

60 + 128 + 95 + 77 = 360

188 + 95 + 77 = 360

283 + 77 = 360

360 = 360

Correct

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.