Solve the equation by completing the square: z^2 - 2z = 323

a. -17, 19
b. -17, -19
c. 17, -19
d. 17, 19

A. -17 , 19

Step-by-step explanation:

Move all terms to one side.

z^2-2z-323=0

z^2 −2z−323=0

Factor : z^2-2z-323

z^2−2z−323.

(z-19)(z+17)=0(z−19)(z+17)=0

Solve for z.

z=19,−17

555.99.

step-by-step explanation:

hope this

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.