A regular olygon has an angle of 160 degree each. how many sides does the polygon have

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

Anyone know? will mark brainliest if correct!

Polynomial that can be factored as (3x-4)(3x+4)