What are the solutions of this quadratic equation?
x + 2x=-2

Step-by-step explanation:

The first step is to combine like terms. x + 2x = 3x, the equation is now 3x= -2

Now divide 3 on both sides to get x = or -0. repeating 6

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

i don't see any

step-by-step explanation: